Rita is proving that the following trigonometric identity is true:

cos(−θ)/sin(−θ)=−1/tanθ

Which step would be the first line of her proof?

A) cosθ /sin θ= −1/tan θ

B) cosθ /−sin θ= −1/ tanθ

C) cos(−θ) ⋅ tanθ = sin(−θ)

D) cos(−θ) / sinθ = −1/tanθ

jjennylove Nov 17, 2018