If cos25^@ + sin 25^@ = K, then cos 50^@...

If `cos25^@ + sin 25^@ = K`, then `cos 50^@` equals

A

`-K sqrt(2-K^2)`

B

`K sqrt(1-K^2)`

C

`-Ksqrt(1-K^2)`

D

`K sqrt(2-K^2)`

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The correct Answer is:

D

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