$12tanb+5=5tanb+5$
$6\left(x-2\right)-4\left(x-1\right)=4$
$\int\left(x^2-1\right)\sqrt{2}dx$
$2^{19}$
$\left(13-x^2\right)^2$
$\left(\sec-\cos\right)\left(\cot+\tan\right)=\tan\sec$
$x2-4x-12\:x\:x-3$
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