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شائع علم المثلثات >

2sin(x-pi/4)+sqrt(2)cos(x)=1

الحلّ

2 sin (x - \frac{π}{4}) + 2 cos (x) = 1

الحلّ

x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn

درجات

x = 4 5^{\circ} + 36 0^{\circ} n, x = 13 5^{\circ} + 36 0^{\circ} n

خطوات الحلّ

2 sin (x - \frac{π}{4}) + 2 cos (x) = 1

Rewrite using trig identities

2 sin (x - \frac{π}{4}) + 2 cos (x) = 1

Rewrite using trig identities

sin (x - \frac{π}{4})

sin (s - t) = sin (s) cos (t) - cos (s) sin (t)

:فعّل متطابقة الطرح لزوايا

= sin (x) cos (\frac{π}{4}) - cos (x) sin (\frac{π}{4})

sin (x) cos (\frac{π}{4}) - cos (x) sin (\frac{π}{4})

بسّط:

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

sin (x) cos (\frac{π}{4}) - cos (x) sin (\frac{π}{4})

sin (x) cos (\frac{π}{4}) = \frac{2 sin ( x )}{2}

sin (x) cos (\frac{π}{4})

cos (\frac{π}{4})

بسّط:

\frac{2}{2}

cos (\frac{π}{4})

استخدم المتطابقة الأساسيّة التالية:

cos (\frac{π}{4}) = \frac{2}{2}

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}

= \frac{2}{2}

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

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

:اضرب كسور

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

cos (x) sin (\frac{π}{4}) = \frac{2 cos ( x )}{2}

cos (x) sin (\frac{π}{4})

sin (\frac{π}{4})

بسّط:

\frac{2}{2}

sin (\frac{π}{4})

استخدم المتطابقة الأساسيّة التالية:

sin (\frac{π}{4}) = \frac{2}{2}

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}

= \frac{2}{2}

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

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

:اضرب كسور

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

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

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

فعّل القانون

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

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

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

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

بسّط:

2 sin (x)

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

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

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

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

:اضرب كسور

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

2 :

إلغ العوامل المشتركة

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

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

- 2 cos (x) + 2 cos (x) = 0 :

اجمع العناصر المتشابهة

= 2 sin (x)

2 sin (x) = 1

2 sin (x) = 1

من الطرفين

1

اطرح

2 sin (x) - 1 = 0

انقل

1

إلى الجانب الأيمن

2 sin (x) - 1 = 0

للطرفين

1

أضف

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

بسّط

2 sin (x) = 1

2 sin (x) = 1

2

اقسم الطرفين على

2 sin (x) = 1

2

اقسم الطرفين على

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

بسّط

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

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

بسّط:

sin (x)

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

2 :

إلغ العوامل المشتركة

= sin (x)

\frac{1}{2}

بسّط:

\frac{2}{2}

\frac{1}{2}

\frac{2}{2}

اضرب بالمرافق

= \frac{1 \cdot 2}{2 2}

1 \cdot 2 = 2

22 = 2

22

a a = a

:فعْل قانون الجذور

22 = 2

= 2

= \frac{2}{2}

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

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

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

sin (x) = \frac{2}{2} :

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{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn

x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn

رسم

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