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8. Introduction to Trigonometry
medium
જો $\sin 5 \theta=\cos 5 \theta,$ તો $\theta$ મેળવો.
A
$10$
B
$9$
C
$18$
D
$15$
Solution
$\sin 5 \theta=\cos 5 \theta$
$\therefore \sin 5 \theta=\sin (90-5 \theta) \, \therefore 5 \theta=90-5 \theta \, \therefore 10 \theta=90\, \therefore \theta=9$
OR
$\sin 5 \theta=\cos 5 \theta $. But $\sin 45=\cos 45$ $ \therefore 5 \theta=45 $ $ \therefore \theta=9$
Standard 10
Mathematics