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Input:
d(f(x_),x_):=sin(x);
Write:
`d(f(x_),x_):=sin(x);`
Compute:
$$\frac{d}{dx_} f(x_):=sin(x)$$
Output:
$$\frac{d}{dx_} f(x_):=sin(x)== \frac{d}{dx_} f(x_):=sin(x_)$$
Result: $$\frac{d}{dx_} f(x_):=sin(x_)$$
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