NtIf cos-1-x-m- -cos-1-y-n- then x2- m2-2xycos-mn- y2- n2 -n

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Cosine Rule

ntIf cos-1(x/...

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ntIf cos-1(x/m) +cos-1(y/n)=α, then x2/ m2-2xycosα/mn+ y2/ n2 =n

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