Prove that 1+cos 2x=2cos^2x....

Prove that `1+cos 2x=2cos^2x`.

Answer

Step by step text solution for Prove that 1+cos 2x=2cos^2x. by MATHS experts to help you in doubts & scoring excellent marks in Class 11 exams.

|

Explore conceptually related problems

Prove that cos^2 2x-cos^2 6x=sin4x sin8x

Prove that cos6x=32cos^6x-48cos^4x+18cos^2x-1

Prove that cos 6 x=32 cos ^(6) x-48 cos ^(4) x+18 cos ^(2) x-1

If y=sin 2x , Prove that dy/dx=2cos2x

prove that 3 cos^(-1) x = cos^(-1) (4x^3 - 3x), x in [1/2,1]

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

Prove that (cos x-cos y)^(2)+(sin x-sin y)^(2)=4 sin ^(2)((x-y)/(2))

Prove that cos((3pi)/2+x)cos(2pi+x)[cot((3pi)/2-x)+cot(2pi+x)]=1

Show that cos 2 x=cos ^(2) x-sin ^(2) x=2 cos ^(2) x-1=1-2 sin ^(2) x=(1-tan ^(2) x)/(1+tan ^(2) x)

Prove that (cos3x+cos7x-cos2x)/(sin 7x-sin3x-sin2x)=cot2x