Math, asked by BiplabDasDas, 1 year ago

what is the formula of
$2\cos( \alpha ) \cos( \beta )$

Answers

Answered by ajayaj

2

2 cos A cos B = cos ( A+B ) + cos ( A-B )

Answered by Naresh5551

1

cos(a+b) + cos ( a-b)

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