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Evaluate `int(dx)/(sqrt(1-x^(2))(1+sqrt(1-x^(2))))`. |
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Answer» Put `x="sin"theta` ` :. dx="cos"theta"d"theta` ` :. I=int(dx)/(sqrt(1-x^(2))(1+sqrt(1-x^(2))))` `=int("cos"theta"d"theta)/("cos"theta(1+"cos"theta))` `=(1)/(2)int"sec"^(2)(theta)/(2)"d"theta` `="tan"(theta)/(2)+c` `=(2"sin"(theta)/(2)"cos"(theta)/(2))/(2"cos"^(2)(theta)/(2))+c` `=("sin"theta)/(1+"cos"theta)+c` `=(x)/(1+sqrt(1-x^(2)))+c` |
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