$\frac{\left(cos\left(x\right)-sec\left(x\right)\right)}{sin\left(x\right)}$
$2\left(3^2+4^2\right)$
$\left(n^2+20\right)\left(n^2+20\right)$
$3x+2y+-5x+-5y+-3$
$10a+9n+30-16-3n$
$\left(9x^2+6x^3\right)\cdot\left(9x^2-5x^3\right)$
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