Solution

prove

Solution

Solution steps
Use the Angle Sum identity:

Popular Examples

prove tan(pi-θ)=-tan(θ)prove (sin(θ))/(1-cos(θ))=csc(θ)+cot(θ)prove cos^2(5x)-sin^2(5x)=cos(10x)prove tan(2a)-tan(a)=tan(a)sec(2a)prove sin^2(x)-4cos^2(x)=5sin^2(x)-4

Frequently Asked Questions (FAQ)

  • Is cos(z+w)=cos(z)cos(w)-sin(z)sin(w) ?

    The answer to whether cos(z+w)=cos(z)cos(w)-sin(z)sin(w) is True