The terminal side of θ passes through the point (−9,10). What is the exact value of sinθ in simplified form?
Calculate the hypotenuse of the right triangle formed by negative x axis and the point and the origin
hyp^2 = (-9)^2 + 10^2 = 181
hyp = sqrt (181)
Sin = opp/hyp (use reference angle that is negative x axis and the hypotenuse)
10/sqrt181 or 10 sqrt181 / 181