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Question

cos248osin212o is equal to

A
514
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B
5+18
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C
314
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D
3+122
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Solution

The correct option is B 5+18
Given cos248sin212

we know that cos2xcos2y=cos(x+y)cos(xy)

=cos(4812)cos(48+12)

=cos36cos60=(5+14)(12)=5+18

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