Pregunta: y^3y' + x^3 = 0 y' = sec^2y y' sin 2pix = piy cos 2pix yy' + 36x = 0 y' = e^2x-1y^2 xy' = y + 2x^3 sin^2y/x (Set y/x = u) y' = (y + 4x)^2 (set y + 4x = v) xy' = y^2 + y (Set y/x = u) xy' = x + y (Set y/x = u) xy' + y = 0, y(4) = 6 y' = 1 + 4y^2, y(1) = 0 y'cosh^2x = sin^2y, y(0) = 1/2pi dr/dt = -2tr, r(0) = r_0 y' = -4x/y, y(2) = 3 y' = (x + y -

y^3y' + x^3 = 0 y' = sec^2y y' sin 2pix = piy cos 2pix yy' + 36x = 0 y' = e^2x-1y^2 xy' = y + 2x^3 sin^2y/x (Set y/x = u) y' = (y + 4x)^2 (set y + 4x = v) xy' = y^2 + y (Set y/x = u) xy' = x + y (Set y/x = u) xy' + y = 0, y(4) = 6 y' = 1 + 4y^2, y(1) = 0 y'cosh^2x = sin^2y, y(0) = 1/2pi dr/dt = -2tr, r(0) = r_0 y' = -4x/y, y(2) = 3 y' = (x + y - 2)^2, y(0) = 2 (Set v = x + y - 2) xy' = y + 3x^4cos^2 (y/x), (y/x), y(1) = 0 (Set y/x = u)