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شائع علم المثلثات >

cos(x)=(2-tan(x))(1+sin(x))

الحلّ

cos (x) = (2 - tan (x)) (1 + sin (x))

الحلّ

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

درجات

x = 6 0^{\circ} + 36 0^{\circ} n, x = 30 0^{\circ} + 36 0^{\circ} n

خطوات الحلّ

cos (x) = (2 - tan (x)) (1 + sin (x))

من الطرفين

(2 - tan (x)) (1 + sin (x))

اطرح

cos (x) - (2 - tan (x)) (1 + sin (x)) = 0

sin, cos :

عبّر بواسطة

cos (x) - (1 + sin (x)) (2 - tan (x))

tan (x) = \frac{sin ( x )}{cos ( x )}

:Use the basic trigonometric identity

= cos (x) - (1 + sin (x)) (2 - \frac{sin ( x )}{cos ( x )})

cos (x) - (1 + sin (x)) (2 - \frac{sin ( x )}{cos ( x )})

بسّط:

\frac{cos ^{2} ( x ) - ( 2 cos ( x ) - sin ( x ) ) ( 1 + sin ( x ) )}{cos ( x )}

cos (x) - (1 + sin (x)) (2 - \frac{sin ( x )}{cos ( x )})

(1 + sin (x)) (2 - \frac{sin ( x )}{cos ( x )}) = \frac{( 2 cos ( x ) - sin ( x ) ) ( 1 + sin ( x ) )}{cos ( x )}

(1 + sin (x)) (2 - \frac{sin ( x )}{cos ( x )})

2 - \frac{sin ( x )}{cos ( x )}

وحّد:

\frac{2 cos ( x ) - sin ( x )}{cos ( x )}

2 - \frac{sin ( x )}{cos ( x )}

2 = \frac{2 cos ( x )}{cos ( x )}

:حوّل الأعداد لكسور

= \frac{2 cos ( x )}{cos ( x )} - \frac{sin ( x )}{cos ( x )}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

:بما أنّ المقامات متساوية، اجمع البسوط

= \frac{2 cos ( x ) - sin ( x )}{cos ( x )}

= \frac{2 cos ( x ) - sin ( x )}{cos ( x )} (sin (x) + 1)

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

:اضرب كسور

= \frac{( 2 cos ( x ) - sin ( x ) ) ( 1 + sin ( x ) )}{cos ( x )}

= cos (x) - \frac{( 2 cos ( x ) - sin ( x ) ) ( sin ( x ) + 1 )}{cos ( x )}

cos (x) = \frac{cos ( x ) cos ( x )}{cos ( x )}

:حوّل الأعداد لكسور

= \frac{cos ( x ) cos ( x )}{cos ( x )} - \frac{( 2 cos ( x ) - sin ( x ) ) ( 1 + sin ( x ) )}{cos ( x )}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

:بما أنّ المقامات متساوية، اجمع البسوط

= \frac{cos ( x ) cos ( x ) - ( 2 cos ( x ) - sin ( x ) ) ( 1 + sin ( x ) )}{cos ( x )}

cos (x) cos (x) - (2 cos (x) - sin (x)) (1 + sin (x)) = cos^{2} (x) - (2 cos (x) - sin (x)) (1 + sin (x))

cos (x) cos (x) - (2 cos (x) - sin (x)) (1 + sin (x))

cos (x) cos (x) = cos^{2} (x)

cos (x) cos (x)

a^{b} \cdot a^{c} = a^{b + c}

:فعّل قانون القوى

cos (x) cos (x) = cos^{1 + 1} (x)

= cos^{1 + 1} (x)

1 + 1 = 2 :

اجمع الأعداد

= cos^{2} (x)

= cos^{2} (x) - (2 cos (x) - sin (x)) (sin (x) + 1)

= \frac{cos ^{2} ( x ) - ( 2 cos ( x ) - sin ( x ) ) ( sin ( x ) + 1 )}{cos ( x )}

= \frac{cos ^{2} ( x ) - ( 2 cos ( x ) - sin ( x ) ) ( 1 + sin ( x ) )}{cos ( x )}

\frac{cos ^{2} ( x ) - ( - sin ( x ) + 2 cos ( x ) ) ( 1 + sin ( x ) )}{cos ( x )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

cos^{2} (x) - (- sin (x) + 2 cos (x)) (1 + sin (x)) = 0

Rewrite using trig identities

cos^{2} (x) - (- sin (x) + 2 cos (x)) (1 + sin (x))

cos^{2} (x) + sin^{2} (x) = 1

:فعّل نطريّة فيتاغوروس

cos^{2} (x) = 1 - sin^{2} (x)

= 1 - sin^{2} (x) - (- sin (x) + 2 cos (x)) (1 + sin (x))

1 - sin^{2} (x) - (- sin (x) + 2 cos (x)) (1 + sin (x))

بسّط:

sin (x) - 2 cos (x) - 2 cos (x) sin (x) + 1

1 - sin^{2} (x) - (- sin (x) + 2 cos (x)) (1 + sin (x))

- (- sin (x) + 2 cos (x)) (1 + sin (x))

وسٌع:

sin (x) + sin^{2} (x) - 2 cos (x) - 2 cos (x) sin (x)

(- sin (x) + 2 cos (x)) (1 + sin (x))

وسٌع:

- sin (x) - sin^{2} (x) + 2 cos (x) + 2 cos (x) sin (x)

(- sin (x) + 2 cos (x)) (1 + sin (x))

(a + b) (c + d) = a c + a d + b c + b d

(a + b) (c + d) = a c + a d + b c + b d

فعّل قانون التوزيع

a = - sin (x), b = 2 cos (x), c = 1, d = sin (x)

= (- sin (x)) \cdot 1 + (- sin (x)) sin (x) + 2 cos (x) \cdot 1 + 2 cos (x) sin (x)

فعّل قوانين سالب-موجب

+ (- a) = - a

= - 1 \cdot sin (x) - sin (x) sin (x) + 2 \cdot 1 \cdot cos (x) + 2 cos (x) sin (x)

- 1 \cdot sin (x) - sin (x) sin (x) + 2 \cdot 1 \cdot cos (x) + 2 cos (x) sin (x)

بسّط:

- sin (x) - sin^{2} (x) + 2 cos (x) + 2 cos (x) sin (x)

- 1 \cdot sin (x) - sin (x) sin (x) + 2 \cdot 1 \cdot cos (x) + 2 cos (x) sin (x)

1 \cdot sin (x) = sin (x)

1 \cdot sin (x)

1 \cdot sin (x) = sin (x) :

اضرب

= sin (x)

sin (x) sin (x) = sin^{2} (x)

sin (x) sin (x)

a^{b} \cdot a^{c} = a^{b + c}

:فعّل قانون القوى

sin (x) sin (x) = sin^{1 + 1} (x)

= sin^{1 + 1} (x)

1 + 1 = 2 :

اجمع الأعداد

= sin^{2} (x)

2 \cdot 1 \cdot cos (x) = 2 cos (x)

2 \cdot 1 \cdot cos (x)

2 \cdot 1 = 2 :

اضرب الأعداد

= 2 cos (x)

= - sin (x) - sin^{2} (x) + 2 cos (x) + 2 cos (x) sin (x)

= - sin (x) - sin^{2} (x) + 2 cos (x) + 2 cos (x) sin (x)

= - (- sin (x) - sin^{2} (x) + 2 cos (x) + 2 cos (x) sin (x))

افتح أقواس

= - (- sin (x)) - (- sin^{2} (x)) - (2 cos (x)) - (2 cos (x) sin (x))

فعّل قوانين سالب-موجب

- (- a) = a, - (a) = - a

= sin (x) + sin^{2} (x) - 2 cos (x) - 2 cos (x) sin (x)

= 1 - sin^{2} (x) + sin (x) + sin^{2} (x) - 2 cos (x) - 2 cos (x) sin (x)

1 - sin^{2} (x) + sin (x) + sin^{2} (x) - 2 cos (x) - 2 cos (x) sin (x)

بسّط:

sin (x) - 2 cos (x) - 2 cos (x) sin (x) + 1

1 - sin^{2} (x) + sin (x) + sin^{2} (x) - 2 cos (x) - 2 cos (x) sin (x)

جمّع التعابير المتشابهة

= - sin^{2} (x) + sin (x) + sin^{2} (x) - 2 cos (x) - 2 cos (x) sin (x) + 1

- sin^{2} (x) + sin^{2} (x) = 0 :

اجمع العناصر المتشابهة

= sin (x) - 2 cos (x) - 2 cos (x) sin (x) + 1

= sin (x) - 2 cos (x) - 2 cos (x) sin (x) + 1

= sin (x) - 2 cos (x) - 2 cos (x) sin (x) + 1

1 + sin (x) - 2 cos (x) - 2 cos (x) sin (x) = 0

1 + sin (x) - 2 cos (x) - 2 cos (x) sin (x)

حلل إلى عوامل:

(1 - 2 cos (x)) (sin (x) + 1)

1 + sin (x) - 2 cos (x) - 2 cos (x) sin (x)

sin (x)

قم باخراج العامل المشترك

= 1 + sin (x) (1 - 2 cos (x)) - 2 cos (x)

أعد الكتابة كـ

= (1 - 2 cos (x)) sin (x) + 1 \cdot (1 - 2 cos (x))

(1 - 2 cos (x))

قم باخراج العامل المشترك

= (1 - 2 cos (x)) (sin (x) + 1)

(1 - 2 cos (x)) (sin (x) + 1) = 0

حلّ كل جزء على حدة

1 - 2 cos (x) = 0 or sin (x) + 1 = 0

1 - 2 cos (x) = 0 : x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

1 - 2 cos (x) = 0

انقل

1

إلى الجانب الأيمن

1 - 2 cos (x) = 0

من الطرفين

1

اطرح

1 - 2 cos (x) - 1 = 0 - 1

بسّط

- 2 cos (x) = - 1

- 2 cos (x) = - 1

- 2

اقسم الطرفين على

- 2 cos (x) = - 1

- 2

اقسم الطرفين على

\frac{- 2 cos ( x )}{- 2} = \frac{- 1}{- 2}

بسّط

cos (x) = \frac{1}{2}

cos (x) = \frac{1}{2}

cos (x) = \frac{1}{2} :

حلول عامّة لـ

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

sin (x) + 1 = 0 : x = \frac{3 π}{2} + 2 πn

sin (x) + 1 = 0

انقل

1

إلى الجانب الأيمن

sin (x) + 1 = 0

من الطرفين

1

اطرح

sin (x) + 1 - 1 = 0 - 1

بسّط

sin (x) = - 1

sin (x) = - 1

sin (x) = - 1 :

حلول عامّة لـ

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = \frac{3 π}{2} + 2 πn

x = \frac{3 π}{2} + 2 πn

وحّد الحلول

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn, x = \frac{3 π}{2} + 2 πn

\frac{3 π}{2} + 2 πn :

بما أنّ المعادلة غير معرّفة لـ

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

رسم

أمثلة شائعة

sin(θ)= 13/85

sin (θ) = \frac{13}{85}

sin(2x)=((6m-5))/8

sin (2 x) = \frac{( 6 m - 5 )}{8}

cos(θ)= 3/(sqrt(45))

cos (θ) = \frac{3}{45}

cos^2(x)= 9/16

cos^{2} (x) = \frac{9}{16}

sin(4x)=0.5

sin (4 x) = 0.5