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Find the integral of (1)/(sqrt(4x^2+81)) dx. Please show steps and answer.

Find the integral of (1)/(sqrt(4x^2+81)) dx. Please show steps and answer.
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Find the integral of (1)/ (sqrt(4x^2+81)) dx. Please show steps and answer. Solution: Let 2x = 9 tan t Taking the derivative of both sides, we get 2dx = 9 sec2t dt dx = 9/2 sec2t dt sec t tan t +C

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