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[cot(alpha-beta)=(k+1)/(xy)],[" 21.If "a...

[cot(alpha-beta)=(k+1)/(xy)],[" 21.If "a" right angle be divided into three parts "alpha,beta" and "gamma],[" 21.If "a" righ "cos(alpha=(tan beta+tan gamma)/(1-tan beta tan gamma)],[" Prove that "cos(alpha=(tan beta+beta tan gamma)/(1-tan beta tan gamma)]

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