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[" If "" If "cos(alpha+beta)sin(gamma+delta)=cos(alpha-beta)sin(gamma-delta)" ,prove that "cot alpha cot beta cot gamma=cot delta],[" If "[fy sin phi=x sin(2 theta+phi)," prove that "(x+y)cot(theta+phi)=(y-x)cot theta],[" In If "cos(A+B)sin(C-D)=cos(A-B)sin(C+D)," prove that "tan A tan B tan C+tan D=0],[cos(A+B)sin(C-D)=cos(A-B)sin(C+D)," prove that "tan A tan B tan C+tan D=0]

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