1.

If costheta+cosphi=alpha,cos2theta+cos2phi=beta and cos3theta+cos3phi=gamma, then

Answer»

`cos^(2)theta+cos^(2)phi=1+(beta)/(2)`
`costheta.cosphi=(ALPHA^(2))/(2)-(beta+2)/(4)`
`2alpha^(2)+gamma=3alpha(1+beta)`
`alpha+beta+gamma=2alphabetagamma`

ANSWER :A::B::C


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