" If "y sin phi=x sin(2 theta+phi)," prove that "(x+y)cot(theta+phi)=(y-x)cot theta

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If y sin phi=x sin(2 theta+phi) show that (x+y)cot(theta+phi)=(y-x)cot theta

If y sinphi = x sin (2theta + phi) show that (x + y) cot (theta + phi) = (y-x) cot theta .

If sin theta=k sin(theta+phi), show that tan(theta+phi)=(sin phi)/(cos phi-k)

If sin theta = k sin (theta + phi),"show that", tan(theta + phi) = (sin phi)/(cos phi -k).

If theta+phi=45^@ , prove that (cot theta-1) (cot phi-1) =2 .

If tan theta + tan phi = x "and" cot theta + cot phi = y, "prove that " cot ( theta + phi) = 1/x -1/y

if tan theta+tan phi=x and cot theta+cot phi=y prove that cot(theta+phi)=(1)/(x)-(1)/(y)

If 2 tan theta = cot phi, "show that" cos(theta - phi) = 3 cos ( theta + phi).

If tan theta+tan phi=a and cot theta+cot phi=b then cot(theta+phi)=