$2x^2-15x+7$
$\lim_{x\to0}\frac{e^x+e^{-x}-2\cos\left(x\right)}{\sin\left(x^2\right)}$
$\left(b^4-15\right)\left(b^4+14\right)$
$9-\left(-12\right)$
$7\left(2y-8\right)$
$\left(3x^2\:+\:7x\:+\:1\right)-\left(6x^2\:+\:x\:-1\right)$
$\tan\left(x\right)+\sec\left(x\right)=\sin\left(x\right)\csc\left(90-x\right)+\tan\left(x\right)\csc\left(x\right)$
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