My Car Makes A Whining Noise When I Accelerate & Decelerate?

I have a 2005 toyota matrix and a couple weeks ago it started to make a whining noise. I believe it is coming from somewhere in the engine and it happens when i step on the gas. It sounds just like a remote control car. It only does it while the car is in DRIVE. As the car speeds up the whining noise becomes a higher pitch....then becomes a lower pitch as the car is slowing down. I posted a video of it on youtube where you can kind of hear what it sounds like. Any help would be much

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