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यदि sintheta-sinphi=a तथा costheta+cosph...

यदि `sintheta-sinphi=a` तथा `costheta+cosphi=b` हो , तो -

A

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

लिखित उत्तर

Verified by Experts

The correct Answer is:
A, D
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