Q17Long answer
5 85 5 3 63 15. Show that sin –1 + cos –1 = tan –1 . 13 5 16 1 2 1 16. Prove that tan –1 + tan –1 = sin −1 . 4 9 5 –1 1 1 17. Find the value of 4 tan – tan –1 . 5 239 INVERSE TRIGONOMETRIC FUNCTIONS 37 1 3 4– 7 4+ 7
5 85 5 3 63 15. Show that sin –1 + cos –1 = tan –1 . 13 5 16 1 2 1 16. Prove that tan –1 + tan –1 = sin −1 . 4 9 5 –1 1 1 17. Find the value of 4 tan – tan –1 . 5 239 INVERSE TRIGONOMETRIC FUNCTIONS 37 1 3 4– 7 4+ 7