$\int_0^{\frac{\pi}{6}}\left(secx-cosx\right)^2dx$
$14x+13x+12$
$2a^2-2ab+2b^2$
$\int\frac{x+3}{x^3+5x^2+5x+4}dx$
$\frac{6x^2+9y}{\frac{x^2+8x+15}{\frac{4x+6}{x^2+9}}}$
$33<18-5w$
$\left(-x+y\right)-\left\{4x+2y+\left[-x-y-\left(x+y\right)\right]\right\}$
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