For comparison with other CAS choose from: Axiom Derive Macsyma Mathematica Reduce
dsolve( diff(y(x),x) + y(x)*sin(x)/cos(x) - 1/cos(x) = 0, y(x) );
y(x) = sin(x) + cos(x) \_C1
dsolve( x*(1-x ^2)* diff(y(x),x) + (2*x^2-1)* y(x) - x^3* y^3 = 0, y(x));
5
1 2 x + 5 \_C1
----- = 1/5 -------------
2 2 2
y(x) x (- 1 + x )
solve( ", y(x) );
1/2 5 7 2 1/2
5 x (- 2 x + 2 x - 5 \_C1 + 5 \_C1 x )
--------------------------------------------,
5
- 2 x - 5 \_C1
1/2 5 7 2 1/2
5 x (- 2 x + 2 x - 5 \_C1 + 5 \_C1 x )
- --------------------------------------------
5
- 2 x - 5 \_C1
dsolve( diff(y(x),x,x) + 4* diff(y(x),x) + 4*y(x) - x* exp(x) = 0,y(x));
y(x) = 1/9 x exp(x) - 2/27 exp(x) + \_C1 exp(- 2 x) + \_C2 exp(- 2 x) x