dy/dx=cos(x+y) solve by using variable saperation method
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d y / dx = cos ( x+ y )
dy / dx = d cos ( x + y )/ dx
dy / dx = cos x + cos y
d y / dx = d ( cos x ) / dx + d ( cos y ) / dx
dy / dx = - sinx - sin y
dy / dx = - sin ( x + y )
dy / dx = d cos ( x + y )/ dx
dy / dx = cos x + cos y
d y / dx = d ( cos x ) / dx + d ( cos y ) / dx
dy / dx = - sinx - sin y
dy / dx = - sin ( x + y )
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