Can someone help me with these, i've been looking through my University maths book but couldn't figure out how to do any of these. Any help would be great:

First one

Solve:

Dy/Dx= e^y .Sin^2 X/SecX

X^2 Dy/Dx +2xy=Cos^2X

2 D^2y/Dx^2 -5 dy/dx +2y=0