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

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

A

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

B

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

C

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

D

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

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