" Suppose "f(x)" is differentiable at "x=1" and "lim_(h rarr0)(f(1+h))/(h)=5

Suppose f(x) is differentiable at x=1 and lim_(h rarr0)(1)/(h)f(1+h)=5, then f'(1) equal

lim_(h rarr0)(sin h)/(h)

lim_(h rarr0)(sin(x+h)-sinx)/(h)

lim_(h rarr0)h sin(1/h)

lim_(h rarr0)(log(x+h)-log x)/(h)

lim_(h rarr0)(sin(x+h)-sin x)/(h)

Which of the following statements are true? If fis differentiable at x=c, then lim_(h rarr0)(f(c+h)-f(c-h))/(2h) exists and equals f'(c)

If f is differentiable at x=1,f(1)=0 and lim_(h rarr 0)(1)/(h) f(1+h)=5, f'(1)= a)0 b)1 c)3 d)5

Let f be differentiable at x=0 and f'(0)=1 Then lim_(h rarr0)(f(h)-f(-2h))/(h)=