Prove the following:frac(cos15^@-sin15^@...

Prove the following:`frac(cos15^@-sin15^@)(cos15^@+sin15^@)=1/sqrt3`

A

`(sqrt3-1)/(2sqrt2)`

B

`(sqrt3+1)/(2sqrt2)`

C

`(1-sqrt3)/(2sqrt2)`

D

`(1+sqrt3)/(2sqrt2)`

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