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If alphaandbeta are the two different...

If `alphaandbeta` are the two different roots of equation `a costheta+bsintheta=c` prove that
(i) `tan(alpha+beta)=(2ab)/(a^(2)-b^(2))`
(ii) `cos(alpha+beta)=(a^(2)-b^(2))/(a^(2)+b^(2))`

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