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cos ( theta + alpha)* cos ( theta - alph...

`cos ( theta + alpha)* cos ( theta - alpha) + sin ( theta + alpha) * sin (theta - alpha )=`

A

`cos 2alpha `

B

`sin 2 alpha `

C

`cot 2 alpha `

D

`tan 2 alpha `

Text Solution

Verified by Experts

The correct Answer is:
A
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