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

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