plot cos(pi x), 2*(( (x*2+1)^2 * .0363551 - .3216147) * (x*2+1)^2 + .7853134)*(2x+1)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.