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(Solved): (dots)dy=(dots)dt or (dots)dy=(dots)dx, if separablee^(t)N(dN)/(dt)=e^(-N)+e^(-2t-N)
((tan^(4)(x)+3t ...
(dots)dy=(dots)dt or (dots)dy=(dots)dx, if separablee^(t)N(dN)/(dt)=e^(-N)+e^(-2t-N)
((tan^(4)(x)+3tan^(3)(x)+2)/(sec^(2)(x)+1))(dy)/(dx)=-csc(y)
(dy)/(dx)=(\sqrt(xy))ln(x)
(dP)/(dt)+2tP=4t+P-2