Question

If cosx = -3/5, and pi 15 years ago

Answer 1

When you see fraction made out of 3s 4s or 5s, try to make a 3,4,5 triangle to answer the question with SOH CAH TOA

Answer 2

You need these formulas for this whole HW: http://mathworld.wolfram.com/Double-AngleFormulas.html

Answer 3

Thank you!!!

Answer 4

whats the answer