Solution
prove
Solution
Solution steps
Use the Product to Sum identity:
Popular Examples
prove sin(a-b)=sin(a)cos(b)-cos(a)sin(b)prove 2/(cos(x))=2sec(x)prove cos(x)=sin(x)tan^2(x)cot^3(x)prove 7sin(7pi-x)=7sin(x)prove sin(-θ)+cos(-θ)=cos(θ)-sin(θ)
Frequently Asked Questions (FAQ)
Is cos(a)cos(b)= 1/2 (cos(a-b)+cos(a+b)) ?
The answer to whether cos(a)cos(b)= 1/2 (cos(a-b)+cos(a+b)) is True