$\left(1-\cos\left(x\right)\right)\left(1+\cos\left(x\right)\right)\left(1+\cot^2\left(x\right)\right)$
$5\cdot1-1$
$\lim_{x\to+\infty\:\:}\left(-in\left(x+1\right)-in\left(x\right)\right)$
$8x-3+x-1$
$26\sin\left(x\right).\cos\left(x\right)-13\sin\left(x\right)=7$
$\left(\frac{1}{b}\right)^2$
$a^6b^8-36$
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