Asked by vishal
                Use the indicated substitution to evaluate the integral 
integral 18sec(2x) tan(2x)dx, u=2x
            
        integral 18sec(2x) tan(2x)dx, u=2x
Answers
                    Answered by
            Steve
            
    recall that integral secu tanu du = secu
Let u=2x and you have du=2dx, so
integral 9 secu tanu du = 9secu = 9sec2x
    
Let u=2x and you have du=2dx, so
integral 9 secu tanu du = 9secu = 9sec2x
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