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If alpha and beta are 2 distinct ro...

If ` alpha ` and ` beta ` are 2 distinct roots of equation ` a cos theta + b sin theta = C ` then ` cos( alpha + beta ) = `

A

` (2 ab)/(a^(2)+ b^(2))`

B

` (2 ab)/(a^(2) - b^(2))`

C

` (a^(2) + b^(2))/(a^(2) - b^(2))`

D

` (a^(2) - b^(2))/(a^(2) + b^(2))`

Text Solution

Verified by Experts

The correct Answer is:
D
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