Practice problem
Solve for all solutions. cos(2x)cos(x)+sin(2x)sin(x)=1\\\cos(2x)\cos(x)+\sin(2x)\sin(x)=1cos(2x)cos(x)+sin(2x)sin(x)=1
x=0x=0x=0
x=πkx=\pi kx=πk
x=2πkx=2\pi kx=2πk
x=3πkx=3\pi kx=3πk
Type a concept, like “slope” or “photosynthesis”.