Q30Multiple choice
If tan–1 x + tan–1y = , then cot–1 x + cot–1 y equals π 2π 3
- (A)
- (B)
- (C)
- (D)π 5 5 5 2a –1 1– a 2x If sin 2 + cos = tan –1 , where a, x ∈ ]0, 1, then 2 1– x 2 –1 31. 1+ a 1+ a the value of x is a 2a (A) 0 (B) (C) a (D) 2 1– a 2 INVERSE TRIGONOMETRIC FUNCTIONS 39 –1 7 The value of cot cos is 25 32. 25 25 24 7 (A) (B) (C) (D) 24 7 25 24 1 –1 2