Solve y′=ytanxy' = y \tan xy′=ytanx.
y=Csecxy = C \sec xy=Csecx
y=Ccosxy = C \cos xy=Ccosx
y=ln∣secx∣+Cy = \ln|\sec x| + Cy=ln∣secx∣+C
y=tanx+Cy = \tan x + Cy=tanx+C