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Input:
d(cot(x*y), y)
Write:
`d(cot(x*y), y)`
Compute:
$$\frac{d}{dy} cot(x\ y)$$
Output:
$$\frac{d}{dy} cot(x\ y)== (-{csc(x\ y)}^{2})\ x$$
Result: $$(-{csc(x\ y)}^{2})\ x$$
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