The angle formed by the positive `y-a xi s` and the tangent to `y=x^2+4x-17a t(5/2,-3/4)` is `tan^(-1)(9)` (b) `pi/2-tan^(-1)(9)` `pi/2+tan^(-1)(9)` (d) none of these

The angle formed by the positive y - axis and the tangent to y=x^2+4x-17 at (5/2,-3/4) is: (a) tan^(-1)(9) (b) pi/2-tan^(-1)(9) pi/2+tan^(-1)(9) (d) none of these

The angle formed by the positive y - axis and the tangent to y=x^2+4x-17 at (5/2,-3/4) is: (a) tan^(-1)(9) (b) pi/2-tan^(-1)(9) pi/2+tan^(-1)(9) (d) none of these

The angle formed by the positive y - axis and the tangent to y=x^2+4x-17 at (5/2,-3/4) is: (a) tan^(-1)(9) (b) pi/2-tan^(-1)(9) pi/2+tan^(-1)(9) (d) none of these

The angle formed by the positive y-axis and the tangent to y=x^(2)+4x-17 at ((5)/(2),-(3)/(4)) is tan^(-1)(9)( b) (pi)/(2)-tan^(-1)(9)(pi)/(2)+tan^(-1)(9) (d) none of these

tan^(-1)(x/2)+tan^(-1)(x/3)=(pi)/(4)

tan^(-1)2x+tan^(-1)3x=(pi)/(4)

"tan"^(6) (pi)/(9)-33 "tan"^(4)(pi)/(9) +27 "tan"^(2)(pi)/(9)=

prove that tan ^(-1)"" (1)/(4) + tan ^(-1) ""(2)/(9) + tan ^(-1) "" (1)/(5) + tan ^(-1) ""(1)/(8) =(pi)/(4).

The angle between the normals of ellipse 4x^2 + y^2 = 5 , at the intersection of 2x+y=3 and the ellipse is (A) tan^(-1) (3/5) (B) tan^(-1) (3/4) (C) tan^(-1) (4/3) (D) tan^(-1) (4/5)