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Q.

2sin2(81°2)+4cos16°sin(71°2)sin(81°2)+cos32°=         

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a

3122

b

3+122

c

2+3

d

23

answer is B.

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Detailed Solution

2sin2(81°2)+4cos16°sin(71°2)sin(81°2)+cos32°

=2sin2(81°2)+2cos16°.2sin(71°2)sin(81°2)+2cos2161

=2sin2(81°2)+2cos16°(cos1°cos16°)+2cos2161

=(12sin2(81°2))+2cos16°.cos1°2cos216°+2cos216°

=cos17°+(cos17°+cos15°)

=cos15°=3+122

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