5) Find the value of sin θ given cos θ = 0.8 and tan θ < 0.
Cos =.8 Tan = sin/cos since tan < 0 sin is <0
s^2 + c^2 = 1
s^2 = 1-.64
s^2 = .36
s = +-.6 but must be neagtive so sin = -0.6
