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(4) dy/dx = y(1-x)/x, dy/y = (1-x)dx/x = (1/x-1)dx
lny = lnx - x + lnC, y = Cx/e^x
(5) √(1-x^2)dy/dx = √(1-y^2)
dy/√(1-y^2) = dx/√(1-x^2)
arcsiny = arcsinx + C
lny = lnx - x + lnC, y = Cx/e^x
(5) √(1-x^2)dy/dx = √(1-y^2)
dy/√(1-y^2) = dx/√(1-x^2)
arcsiny = arcsinx + C
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