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integrate (tan (x))
-log(-cos(x)**2)/2
integrate(tan(x), x)
plot(-log(sin(x)**2 - 1)/2)
solve(-log(sin(x)**2 - 1)/2, x)
diff(-log(sin(x)**2 - 1)/2, x)
series(-log(sin(x)**2 - 1)/2, x, 0, 10)
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