Solution

prove

Solution

Solution steps
Use the Angle Sum identity:

Popular Examples

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

Frequently Asked Questions (FAQ)

  • Is cos(x+y)=cos(x)cos(y)-sin(x)sin(y) ?

    The answer to whether cos(x+y)=cos(x)cos(y)-sin(x)sin(y) is True