trigonometry
posted by Dini .
Prove: sin3xsinx/cos3xcosx=cot2

I think I would use the sum formulas, changing sin3x to sin(2x+x) and cos3x to cos(2x+x), then gather terms.
posted by Dini .
Prove: sin3xsinx/cos3xcosx=cot2
I think I would use the sum formulas, changing sin3x to sin(2x+x) and cos3x to cos(2x+x), then gather terms.