$19a-2p-5a+10p$
$\left(1-cos^2x\right).\sec^2=\tan^2$
$9z^4-6\sqrt{78}z^4-78z^2$
$\frac{x^5+12}{x^2+x+2}$
$\left(5^2-\:x^2\right)$
$3x^2+2\sqrt{3x}\sqrt{10i}-10$
$\sin\left(20\right)\cot\left(20\right)=\cos\left(20\right)$
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