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[" Prove that "],[cos2x cos(x)/(2)-cos3x...

[" Prove that "],[cos2x cos(x)/(2)-cos3x cos(9x)/(2)=sin5x sin(5x)/(2).]

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Prove that, cos2xcos""(x)/(2)-cos3xcos""(9x)/(2)=sin5xsin""(5x)/(2) .

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

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

cos x cos((x)/(2))-cos3x cos((9x)/(2))=sin7x sin8x

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

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

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

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

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