# Inverse Trigonometry – Theorem

Inverse Trigonometry – Theorem Statement: Tan⁻¹ x + Tan⁻¹ y = Tan⁻¹ for x > 0, y > 0, xy < 1 = π + Tan⁻¹ for x > 0, y > 0, xy > 1. Proof: Case (i): Suppose x > 0, y > 0, xy < 1 x > 0 → 0 < Tan⁻¹ Read more about Inverse Trigonometry – Theorem[…]