Question

if cos theta = -4/7 what are the values of sin theta and tan theta?

Answer 1

          cosθ = ⁻⁴/₇
cos⁻¹(cosθ) = cos⁻¹(⁻⁴/₇)
                θ = 124.8499046

sinθ = sin(124.8499046) = 0.820651806
tanθ = tan(124.8499046) = -1.436140661