Home
Class 11
MATHS
cos x cos (x/2)-cos 3x cos ((9x)/2) = si...

`cos x cos (x/2)-cos 3x cos ((9x)/2) = sin 4x sin( (7x)/2).`

Promotional Banner

Similar Questions

Explore conceptually related problems

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

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