Solve (1+x) dy = (x - tan y) dx
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tanxdy +tanydx=0
⇒
tan y
−dy
=
tan x
dx
⇒
sin y
−cos y dy
=
sin x
cos x dx
⇒
t
−dt
=
k
dk
[t=sin y;k=cos x]
⇒log C=log Kt
⇒C=sin x sin y
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