The equation of the tangent to the curve
x - y + 1 = 0
x + y + 1 = 0
2x - y + 1 = 0
x + 2y + 2 = 0
Let f be twice differentiable function such that f"(x) = - f(x) and f'(x) = g(x), h(x) = {f(x)}2 + {g(x)}2. If h(5) = 11, then h(10) is equal to :
22
11
0
20
B.
11
A differentiable function f(x) is defined for all x > 0 and satisfies f(x3) = 4x4 for all x > 0. The value of f'(8) is :