$\frac{1}{1-sinx}-\frac{1}{1+sinx}+2tanxsecx$
$3y^2dx=6x^4dy$
$2.2^2-0.7\cdot1.8$
$324\cdot10^4$
$\int xcos3x\:dx$
$\frac{15b-5b^3d+25b}{5d}$
$\frac{x^2+2x-8}{x^2-36}\cdot\frac{2x^2-9x-18}{5x^2-20}$
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