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x=sqrt(a^(2)cos^(2)alpha+b^(2)sin^(2)alp...

`x=sqrt(a^(2)cos^(2)alpha+b^(2)sin^(2)alpha)+sqrt(alpha^(2)sin^(2)alpha+b^(2)cos^(2)alpha)`
then `x^(2)=alpha^(2)+b^(2)+2sqrt(p(a^(2)+b^(2))-p^(2))`, where p is equal to

A

`a^(2)cos^(2)alpha+b^(2)sin^(2) alpha`

B

`a^(2)sin^(2)alpha+b^(2) cos^(2) alpha`

C

`1/2 [ a^(2)+b^(2)+(a^(2)-b^(2))cos 2 alpha]`

D

`1/2 [ a^(2) + b^(2)-(a^(2)-b^(2))cos 2 alpha]`

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The correct Answer is:
A, B, C, D
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