trigonometry??

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weightage of trignometry in cat 13?
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If cot^2 (x) = cot (x - y) cot(x - z)

then show that cot (2x) = 1/2[cot(y) + cot(z)]

Everything I like is either illegal, immoral, fattening or expensive
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weightage of trignometry in cat 13?


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