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If If x cosalpha+y sinalpha=2a, x cos be...

If `If x cosalpha+y sinalpha=2a, x cos beta+y sinbeta=2aand 2sin""(alpha)/(2)sin""(beta)/(2)=1,` then

A

`cos alpha + cos beta = ( 2ax )/( x^(2) + y^(2))`

B

`cos alpha cos beta = ( 2a^(2) - y^(2))/( x^(2) + y^(2))`

C

`y^(2) = 4a (a-x)`

D

`cos alpha + cos beta =2 cos alpha cos beta`

Text Solution

Verified by Experts

The correct Answer is:
C
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