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8. Introduction to Trigonometry
medium
જો $3 \theta$ એ લઘુકોણમાંથી મેળવેલ હોય અને $\sin 3 \theta=\cos (\theta-26),$ હોય તો $\theta =\, \ldots \ldots \ldots \ldots$
A
$64$
B
$16$
C
$29$
D
$58$
Solution
$\sin 3 \theta=\cos (\theta-26)$
$\therefore \cos (90-3 \theta)=\cos (\theta-26)$
$\therefore 90-3 \theta=\theta-26$
$\therefore 90+26=4 \theta$
$\therefore 4 \theta=116$
$\therefore \theta=29$
Standard 10
Mathematics