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Question

cos(π4+x)+cos(π4x)=2.cosx

A
True
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B
False
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Solution

The correct option is B False
As we know that
cos(A+B)+cos(AB)=2cosAcosB
cos(π4+x)+cos(π4x)=2cosπ4cosx=22cosx=2cosx
So the relation is False

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