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Question

cos70sin20+cos59sin318sin230=


A

1

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B

-1

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C

0

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D

2

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Solution

The correct option is C

0


cos70sin20+cos59sin318sin230

=sin20sin20+sin31sin318(12)2

( cosθ=sin(90θ), sin30=12)

=1+18×14
=22=0


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