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شائع علم المثلثات >

6sin(2x)=3cos(30)

الحلّ

6 sin (2 x) = 3 cos (3 0^{\circ})

الحلّ

x = \frac{0.44783 \dots}{2} + 18 0^{\circ} n, x = 9 0^{\circ} - \frac{0.44783 \dots}{2} + 18 0^{\circ} n

+1

راديان

x = \frac{0.44783 \dots}{2} + πn, x = \frac{π}{2} - \frac{0.44783 \dots}{2} + πn

خطوات الحلّ

6 sin (2 x) = 3 cos (3 0^{\circ})

cos (3 0^{\circ}) = \frac{3}{2}

cos (3 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

cos (3 0^{\circ}) = \frac{3}{2}

cos (3 0^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{3}{2}

= \frac{3}{2}

6 sin (2 x) = 3 \cdot \frac{3}{2}

6

اقسم الطرفين على

6 sin (2 x) = 3 \cdot \frac{3}{2}

6

اقسم الطرفين على

\frac{6 sin ( 2 x )}{6} = \frac{3 \cdot \frac{3}{2}}{6}

بسّط

\frac{6 sin ( 2 x )}{6} = \frac{3 \cdot \frac{3}{2}}{6}

\frac{6 sin ( 2 x )}{6}

بسّط:

sin (2 x)

\frac{6 sin ( 2 x )}{6}

\frac{6}{6} = 1 :

اقسم الأعداد

= sin (2 x)

\frac{3 \cdot \frac{3}{2}}{6}

بسّط:

\frac{3}{4}

\frac{3 \cdot \frac{3}{2}}{6}

3 \cdot \frac{3}{2}

اضرب بـ:

\frac{3 3}{2}

3 \cdot \frac{3}{2}

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

:اضرب كسور

= \frac{3 \cdot 3}{2}

= \frac{\frac{3 3}{2}}{6}

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

: استخدم ميزات الكسور التالية

= \frac{3 \cdot 3}{2 \cdot 6}

2 \cdot 6 = 12 :

اضرب الأعداد

= \frac{3 3}{12}

3 :

إلغ العوامل المشتركة

= \frac{3}{4}

sin (2 x) = \frac{3}{4}

sin (2 x) = \frac{3}{4}

sin (2 x) = \frac{3}{4}

Apply trig inverse properties

sin (2 x) = \frac{3}{4}

sin (2 x) = \frac{3}{4} :

حلول عامّة لـ

sin (x) = a \Rightarrow x = arcsin (a) + 36 0^{\circ} n, x = 18 0^{\circ} - arcsin (a) + 36 0^{\circ} n

2 x = arcsin (\frac{3}{4}) + 36 0^{\circ} n, 2 x = 18 0^{\circ} - arcsin (\frac{3}{4}) + 36 0^{\circ} n

2 x = arcsin (\frac{3}{4}) + 36 0^{\circ} n, 2 x = 18 0^{\circ} - arcsin (\frac{3}{4}) + 36 0^{\circ} n

2 x = arcsin (\frac{3}{4}) + 36 0^{\circ} n

حلّ:

x = \frac{arcsin ( \frac{3}{4} )}{2} + 18 0^{\circ} n

2 x = arcsin (\frac{3}{4}) + 36 0^{\circ} n

2

اقسم الطرفين على

2 x = arcsin (\frac{3}{4}) + 36 0^{\circ} n

2

اقسم الطرفين على

\frac{2 x}{2} = \frac{arcsin ( \frac{3}{4} )}{2} + \frac{36 0 ^{\circ} n}{2}

بسّط

x = \frac{arcsin ( \frac{3}{4} )}{2} + 18 0^{\circ} n

x = \frac{arcsin ( \frac{3}{4} )}{2} + 18 0^{\circ} n

2 x = 18 0^{\circ} - arcsin (\frac{3}{4}) + 36 0^{\circ} n

حلّ:

x = 9 0^{\circ} - \frac{arcsin ( \frac{3}{4} )}{2} + 18 0^{\circ} n

2 x = 18 0^{\circ} - arcsin (\frac{3}{4}) + 36 0^{\circ} n

2

اقسم الطرفين على

2 x = 18 0^{\circ} - arcsin (\frac{3}{4}) + 36 0^{\circ} n

2

اقسم الطرفين على

\frac{2 x}{2} = 9 0^{\circ} - \frac{arcsin ( \frac{3}{4} )}{2} + \frac{36 0 ^{\circ} n}{2}

بسّط

x = 9 0^{\circ} - \frac{arcsin ( \frac{3}{4} )}{2} + 18 0^{\circ} n

x = 9 0^{\circ} - \frac{arcsin ( \frac{3}{4} )}{2} + 18 0^{\circ} n

x = \frac{arcsin ( \frac{3}{4} )}{2} + 18 0^{\circ} n, x = 9 0^{\circ} - \frac{arcsin ( \frac{3}{4} )}{2} + 18 0^{\circ} n

أظهر الحلّ بالتمثيل العشريّ

x = \frac{0.44783 \dots}{2} + 18 0^{\circ} n, x = 9 0^{\circ} - \frac{0.44783 \dots}{2} + 18 0^{\circ} n

رسم

أمثلة شائعة

tan((3θ)/4)=(-sqrt(3))/3

30=15cos((2pi)/(365)t)+43