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[,=(y)/(x)=(x+y)/(xy)=(1)/(y)+(1)/(x)],[...

[,=(y)/(x)=(x+y)/(xy)=(1)/(y)+(1)/(x)],[,:.cot(A-B)=(1)/(y)+(1)/(x)],[E_(x)*7," If "],[tan alpha,=(1)/(sqrt(x(x^(2)+x+1))),tan beta=(sqrt(x))/(sqrt(x^(2)+x+1))" and tany "=sqrt(x^(-3)+x^(-2)+x^(-1))],[," then show that "],[alpha,+beta=gamma]

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