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Math Help - calculas problem

  1. #1
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    calculas problem

    Find .

    Any help would be appreciated cheers x
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  2. #2
    Flow Master
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    Quote Originally Posted by Haris View Post
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    Any help would be appreciated cheers x
    Substitute u = 4 + \cos (y).
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    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by Haris View Post
    Find .

    Any help would be appreciated cheers x
    Let z=4+\cos y\implies \,dz=-\sin y\,dy

    Thus, the integral transforms into -7\int\frac{\,dz}{z}

    Can you take it from here?
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  4. #4
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    I got -7ln(4+cos(y))+C but its wrong i think?
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  5. #5
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    Quote Originally Posted by Haris View Post
    I got -7ln(4+cos(y))+C but its wrong i think?
    Don't be so helpless. Try to differentiate it and see whether you get the integrand ....
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