Solution

prove

Solution

Solution steps
Use the Angle Sum identity:

Popular Examples

prove cos^7(x)=(1-sin^2(x))^3cos(x)prove prove (1+tan(θ))^2=sec^2(θ)+2tan(θ)prove prove (1+cot^2(x))/(2cot(x))=csc(2x)prove prove (sin(θ))/(1-sin^2(θ))=sec(θ)tan(θ)prove prove sin^2(θ)cot^2(θ)=1prove

Frequently Asked Questions (FAQ)

  • Is cos(a+b)=cos(a)cos(b)-sin(a)sin(b) ?

    The answer to whether cos(a+b)=cos(a)cos(b)-sin(a)sin(b) is True