Find the solution of the following Differential Equations

1) y' = ky 3) y'-2y+a = 0 5) (xIn x)y' = y 7) y' = 2xy-1 9) 2y' = y cot(x) 11) y' = (1+x)(1+ y) 13) y' = y tanh(x) 15) y' = y tan(2.x), y(0) = 2 %3D 17) 2.xy' = 3y, y(1) = 4 19) y' = 2e*y', y(0) = 0.5 21) dr sin(0) = 2rcos(0)d0,r(n/2) = 2