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Q.

sin65°+sin25°cos65°+cos25°=

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a

1

b

12

c

1

d

0

answer is A.

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Detailed Solution

sin65°+sin25°cos65°+cos25°

=2sin(65°+25°2)cos(65°25°2)2cos(65°+25°2)cos(65°25°2)

=sin45°cos20°cos45°cos20°

=tan45°=1

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sin65°+sin25°cos65°+cos25°=