Determine all values for x, where 0 ≤ x ≤ 2pi

Question

1. cosx = 0.58
2. tanx = -6.1

Answer 1

cosx = 0.58; x = cos^-1(0.58) = 0.9521 or x = 2π - cos^-1(0.58) = 5.3311

tanx = - -6.1; x = π + tan^-1(- 6.1) = 1.7333 or x = 2π + tan^-1(- 6.1) = 4.8749