$f^2-7f-30$
$\frac{\cos\left(a\right)+\cos\left(b\right)}{\sin\left(a\right)-\sin\left(b\right)}+\frac{\sin\left(a\right)+\sin\left(b\right)}{\cos\left(a\right)-\cos\left(b\right)}$
$2a^2+11+12$
$64t^3+27$
$\left(5x^5y\right)\left(4x^6y^6z^6\right)$
$-4\cdot\left(-5+12\right)$
$\left(9^2\cdot7^{-4}\right)^2\:\;\:\left(3^5\cdot7^{-8}\cdot\:5^{-2}\right)^{-1}$
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