- #1
muzialis
- 166
- 1
Hello there,
I have the function
$$f(t) = \int_0 ^{t} \frac{1}{\sqrt{t-\tau}} \mathrm{d}\tau$$
The integral can be found, yielding an expression as
$$f(t) = 2 \sqrt{t} $$
The question is, if I tried to calculate the derivative of $$f$$, using the "derivation under the integral " rule I get
$$\frac {\mathrm{d} f }{\mathrm{d}t} = \int_0 ^{t} \frac{\mathrm{d}}{\mathrm{d}t} \frac{1}{\sqrt{t-\tau}} \mathrm{d}\tau + \frac{1}{\sqrt{t-t}} $$
which is a problem I never run across.
I went through the derivation of the "derivation under the integral " but I am not getting anywhere, for the moment.
Anybody's help would be appreciated, thanks
I have the function
$$f(t) = \int_0 ^{t} \frac{1}{\sqrt{t-\tau}} \mathrm{d}\tau$$
The integral can be found, yielding an expression as
$$f(t) = 2 \sqrt{t} $$
The question is, if I tried to calculate the derivative of $$f$$, using the "derivation under the integral " rule I get
$$\frac {\mathrm{d} f }{\mathrm{d}t} = \int_0 ^{t} \frac{\mathrm{d}}{\mathrm{d}t} \frac{1}{\sqrt{t-\tau}} \mathrm{d}\tau + \frac{1}{\sqrt{t-t}} $$
which is a problem I never run across.
I went through the derivation of the "derivation under the integral " but I am not getting anywhere, for the moment.
Anybody's help would be appreciated, thanks