Question

») sin or Sin 20+ sin 30= sind & Cosot C0520+ COS 302 cosa Pala ba 10 2x dj a16

JEE/Engineering Exams

Maths

Solution

172

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( operatorname{sol}^{n} cdot sin theta+sin 3 theta+sin 2 theta=sin alpha ) ( 2 sin 2 theta cos theta+sin 2 theta=sin alpha ) ( sin 2 theta(2 cos theta+1)=sin alpha=(1) ) ( cos theta+cos 3 theta+cos 2 theta=cos alpha ) ( 2 cos 2 theta cos theta+cos 2 theta=cos alpha=(1) ) ( (1)^{circ}=cos 2 theta(2 cos theta+1)=cos alpha=(1) ) ( 2 theta=tan theta )