[" hove that "],[cos2x cos(x)/(2)-cos3x],[sin5x sin(5x)/(5)]

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Prove that: cos2x cos(x/2)-cos3x cos((9x)/2)=sin5x sin((5x)/2)

Prove that cos 2xcos(x/2)-cos 3x cos((9x)/2)= sin5x sin((5x)/2) .

Prove that cos2x cos((x)/(2))-cos3x cos((9x)/(2))=sin5x sin((5x)/(2))

cos2x(cos x)/(2)-cos3x(cos(9x))/(2)=sin5x(sin(5x))/(2)

Prove that (cos5x + cos3x)/(sin5x + sin3x) = cot4x

Prove that cosquad 2x(cos x)/(2)-cos3x cos(9(x)/(2))=sin5x(sin(5x))/(2)

Prove that cos 2 x cos ""x/2 - cos 3x cos ""(9x)/(2) = sin 5x sin ""(5x)/(2)

Prove that : (cos 9x - cos 5x)/(sin 17x -sin 3x)=- (sin 2x)/(cos 10x) .

Prove that (cos(9x)-cos(5x))/(sin(17x)-sin(3x))=-(sin(2x))/(cos(10x))

Prove that cos 2x cos "" x/2 -cos 3x cos " (9x)/(2) = sin 5x sin ""(5x)/(2).