$\left(1-tanx\right)\left(1-cotx\right)$
$\frac{x^29}{x+3}$
$-6\cdot18$
$3e-8e+5e-4e+2e-11e-2e$
$2x^5-x^3+2x^2-3x-3:2x^2-3$
$\int\left(\left(2x-5\right)\left(3x^2+4x\right)\right)dx$
$\frac{7}{8\pi}\sin\left(8n\right)+\frac{7}{9\pi}\cos\left(9n\right)$
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