$81^{4^4}$
$-16-\left(-45+13\right)+\left(3-8+9\right)$
$20x^2+7x-6$
$\lim_{x\to45}\left(cot\:x\right)$
$\left(a^{n-1}-b^{n+2}\right)^2$
$\left(3c-4m\right)^3$
$-a\cdot cos\left(x\right)sin\left(y\right)sin\left(z\right)\:+\:cos\left(x\right)cos\left(y\right)cos\left(z\right)\:+\:cos\left(x\right)sin\left(y\right)$
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