Recent content by mathguyz

  1. M

    Undergrad Solve 3cos^2(3x)+3sin^2(3x)=3: Trig Identities

    Everyone knows the obvious trig identities like sin^2 + cos^2 =1, cosx=1+ sin^2, and tanx =sin/cos. I ran across an old identity the other day: 3cos^2(3x)+3sin^2(3x)=3. Can anyone here figure out why and how? I tried it and couldn't figure it out.
    • mathguyz
    • Thread
    • identities Trig Trig identities
    • Replies: 2
    • Forum: Calculus
  2. M

    Undergrad Integrals of Trig Powers: Sin^2dx and Cos^2dx

    The calculus book places an emphasis on multiple powers of trig functions in the book. Does anyone here really know what the integral of sin^2dx is? What about the integral of cos^2dx is? I don't think I ve actually ever seen it.
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    High School What is the Indefinite Integral of 1/e^x?

    Does anyone here know what the indefinite integal of 1/e^x is? Im an new member and, this is my first post.