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Integrals of Trigonometric Functions

  1. Sep 20, 2009 #1
    I have three problems that I'm having a hard time with. I'd appreciate any help with
    any of the three problems.

    [tex]\int((cos(x))^6)dx[/tex]

    AND

    [tex]\int(x^3 * sqrt(x^2 - 1)[/tex]

    AND

    Solve for y (separation of variables):
    dy/dx = ((2y + 3)^2)/((4x + 5)^2)

    THANKS soo much.
     
  2. jcsd
  3. Sep 20, 2009 #2

    lurflurf

    User Avatar
    Homework Helper

    first one reduction formuls or integration by parts (integrate cos(x) differentiate cos(x)^5)
    second one substitute x^2-1->w
    third one just separate and integrate
     
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