
Mark M. answered 12/17/19
Tutor
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Mathematics Teacher - NCLB Highly Qualified
If cos θ = -4/5 in QII, then sin θ = 3/5
sin 2θ = 2 sin θ cos θ
cos 2θ = cos2 θ - sin2 θ
Can you substitute values and answer?
Ani S.
No, I don't know how to answer it. I would like you help me to solve this problem.12/17/19