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Math Help - integration with trig functions

  1. #1
    Junior Member cinder's Avatar
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    integration with trig functions

    What is the integrated form of \int4cos(5x)dx and \int\frac{4}{cos^2x}dx?

    The answers I got are \frac{4}{5}sin(5x)+C and 4tanx+C, respectively.
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  2. #2
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    Are you wanting the process of finding those, or are you just checking to see if the answers are correct? You could just check by differentiating; if you do, you will notice that those are the correct answers.
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  3. #3
    Junior Member cinder's Avatar
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    I thought they were correct, but I'm looking at an old calculus exam of mine and they are marked wrong.

    I guess I should have said something earlier. Thanks.
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  4. #4
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    Quote Originally Posted by cinder
    I thought they were correct, but I'm looking at an old calculus exam of mine and they are marked wrong.

    I guess I should have said something earlier. Thanks.
    Maybe you did the oldest mistake in the book, you forgot the constant at the end?


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