4
2√3
6
3√2
Correct answer is B
f:x→2tanx
g:x→√(x2+8)
(gof)=√((2tanx)2+8)
( g o f )(45º) = √((2 tan 45º)^2 + 8)
= √(4 + 8) = √12
= √(4 x 3)
∴ 2√3
If m and ( m + 4) are the roots of 4x^2 - 4x - 15 = 0, find the equation whose roots are 2 m and...
If \begin{vmatrix} m-2 & m+1 \\ m+4 & m-2 \end{vmatrix} = -27, find the value of m...
Find the unit vector in the direction of the vector -12i + 5j...
If y^{2} + xy - x = 0, find \frac{\mathrm d y}{\mathrm d x}....
What is the coordinate of the centre of the circle 5x^{2} + 5y^{2} - 15x + 25y - 3 = 0?...
The gradient of point P on the curve y = 3x^{2} - x + 3 is 5. Find the coordinates of P....
Determine the coefficient of x^3 in the binomial expansion of ( 1 + \frac{1}{2}x) ...
The functions f:x → 2x^2 + 3x -7 and g:x →5x^2 + 7x - 6 are defined on the se...