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If cos theta+cos phi=a and sin theta - s...

If `cos theta+cos phi=a` and `sin theta - sin phi=b`, then: `2cos(theta + phi)`=

A

`a^2-b^2-2`

B

`a^2-b^2+2`

C

`a^2+b^2+2`

D

`a^2+b^2-2`

Text Solution

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The correct Answer is:
D
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