# Math Help - Prove this integral is equal to zero

1. ## Prove this integral is equal to zero

I was tutoring an engineer student and we are stuck at this one problem.

Prove that $\frac {1}{T} \int _{0}^{T} [V I \sin ( \theta ) \sin (2 \omega t ) ] dt = 0$

I rarely deal with integrals like this and not really sure how to proceed. He is taking an undergrad. engineering class and I suppose this shouldn't be too difficult. Are there any hints or at least some resource I can read get hints from?

Thank you.

I was tutoring an engineer student and we are stuck at this one problem.

Prove that $\frac {1}{T} \int _{0}^{T} [V I \sin ( \theta ) \sin (2 \omega t ) ] dt = 0$

I rarely deal with integrals like this and not really sure how to proceed. He is taking an undergrad. engineering class and I suppose this shouldn't be too difficult. Are there any hints or at least some resource I can read get hints from?

Thank you.
Is $\omega$ defined in terms of $T$?

I was tutoring an engineer student and we are stuck at this one problem.

Prove that $\frac {1}{T} \int _{0}^{T} [V I \sin ( \theta ) \sin (2 \omega t ) ] dt = 0$

I rarely deal with integrals like this and not really sure how to proceed. He is taking an undergrad. engineering class and I suppose this shouldn't be too difficult. Are there any hints or at least some resource I can read get hints from?

Thank you.
What's that $\theta$ doing in there? You could start by taking the $VI$ out and if $\theta$ is suppose to be there then that's constant so take that one out too. Otherwise, why don't you just evaluate the general expression:

$\int_0^T \sin(t)\sin(2\omega t)dt=0$

and figure out what $T,\omega$ have to be to make it so.