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Math Help - Calculator help

  1. #1
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    Calculator help

    We are doing integrals and I have the problem that is the integral from 0 to pi/2 2cos^5x(dx) n=4 therefore, dX=pi/8

    We are asked for the midpoint values and I got

    (pi/8) (2 cos^5(pi/16) + 2 cos^5(3 pi/16) +2 cos^5(5pi/6)+2 cos^5(7pi/16))

    I tried putting this into the google calculator and it didn't give me an answer. I assume that the " ^5 " is giving it a problem but I'm not sure. Any tips?
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  2. #2
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    Re: Calculator help

    To use a calculator, you will need to enter things like \displaystyle \begin{align*} \cos^n{(bx)} \end{align*} as ( cos(b*x) )^n .
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    Re: Calculator help

    Another tip: make sure the calculator is in "radians" mode. When you have \cos\frac{5\pi}{16}, the \frac{5\pi}{16} is \frac{5\pi}{16} radians, not \frac{5\pi}{16} degrees. You undoubtedly know that, but it's easy to forget to make sure the calculator is in the right mode.

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    Re: Calculator help

    thank you! it works!
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