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Question

Find:
cos70sin20+cos59sin318sin230= ______.

A
1
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B
-1
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C
0.0
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D
2
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Solution

The correct option is C 0.0
cos70sin20+cos59sin318sin230sin20sin20+sin31sin318(12)2( cosθ=sin(90θ), sin30=(12)1+18×1422=0

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