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If sintheta+sinphi=aand costheta+cosphi ...

If `sintheta+sinphi=aand costheta+cosphi =b,` then

A

`cos((theta-phi)/(2))=+-1/2sqrt(a^(2)+b^(2))`

B

`cos((theta-phi)/(2))=+-sqrt(a^(2)+b^(2))`

C

`tan((theta-phi)/(2))=+-sqrt((4-a^(2)-b^(2))/(a^(2)+b^(2)))`

D

`cos(theta-phi)=(a^(2)+b^(2)-2)/(2)`

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