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(1-sin (x)**2)/(1+tan (x)**2)
cos(x)**4
solve((-sin(x)**2 + 1)/(tan(x)**2 + 1), x)
diff((-sin(x)**2 + 1)/(tan(x)**2 + 1), x)
series((-sin(x)**2 + 1)/(tan(x)**2 + 1), x, 0, 10)
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