Question

Use the fugue to find the exact values of sin 2u, cos 2u, and tan 2u

Answer 1

sin 2u= 2sin u*cos u=2*(-3/5)*4/5=-24/25
cos 2u= 1-2sin^2(u)=1-2*(9/25)=1-18/25=7/25
tan 2u= sin/cos=-24/7
These are the correct answers.