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Q.

sin65°+sin25°

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a

2sin20°

b

2cos20°

c

3cos20°

d

3sin20°

answer is A.

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Detailed Solution

sin65°+sin25°

=2sin(65°+25°2)cos(65°25°2)

=2sin45°cos20°

=2×12cos20°

=2cos20°

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