Trigonometric Identities Std. F.TF.8
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D
Marty is proving that the following trigonometric identity is true: tan^2 θ ⋅ cos^2 θ = 1 − cos^2 θ Which step would be the first line of his proof?
A
The angle θ lies in Quadrant II . cosθ= −2/3 What is tan θ?
D
The angle θ lies in Quadrant II . sinθ= 3/4 What is cos θ?
B
cos(−θ)=√3/4 , sinθ<0 What is the value of sin θ?
C
sin(−θ)=−1/4 and tanθ=√15/15 What is the value of cos θ?