$\lim_{x\to0}\:\:\frac{1}{\sin\left(x\right)}-\frac{x}{\sin\left(x\right)}$
$\left(4x^2-5y^2\right)^3$
$6x^2+11x+3=0$
$-\left(-1\right)-\left(-7\right)$
$m^6-25$
$12x-40>20$
$\int\left(3xcosx\right)dx$
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