Differentiate $f(x)=\int_{\tan x}^{0} \frac{\cos t}{1+e^t}dt$

Differentiate
$$f(x)=\int_{\tan x}^{0} \frac{\cos t}{1+e^t}dt$$

Calculus Integrals Algebra
Xander G Xander G
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Erdos Erdos
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