1. ## Urgent Calculus help needed please

Hello all , I am in a bit of a quandry as this question has got me really stumped does anybody know how to do it please ?

1. In an electrical circuit an alternating voltage is given by v=25Sin100πt volts
2. Determine:
3. the mean and
4. the r.m.s.
values each correct to 2 decimal places over the range t = 0 to t = 10 ms.

2. mean = $\frac 1 {0.01}\int ^{0.01} _0 25 Sin(100 \pi t) dt$

rms = $\left( \frac 1 {0.01}\int ^{0.01} _0 [25 Sin(100 \pi t)]^2 dt \right) ^{1/2}$