Input:
dsolve(y(1,x)=cos(x-y))
Write:
`dsolve(y(1,x)=cos(x-y))`
Output:
$$dsolve(y^{(1)}(x)=cos(x-y))== (-2.0)\ acot((-c_1)-x)+x$$
Result: $$(-2.0)\ acot((-c_1)-x)+x$$
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