Question

Jika cosA= 3/8 dg 0derajat < A < 9derajat tentukan sin A dan tan A

Answer 1

Sin² A + cos² A = 1
sin² A + (3/8)² = 1
sin² A + 9/64 = 64/64
sin² A = 64/64 - 9/64 = 55/64
sin A = 1/8 x √55 = (√55) / 8
tan A = sin A / cos A = √55/8  /  3/8  = √55 / 3