Input:
integrate(tan(x), x, 0, pi/2)
Write:
`integrate(tan(x), x, 0, pi/2)`
Output:
$$\int _{0}^{\frac {\pi }{2}} tan(x)\ dx== (-log(cos(\frac{1}{2}\ \pi )))$$
Result: $$(-log(cos(\frac{1}{2}\ \pi )))$$
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