$-x^2+x+4$
$\left(2x+3b^2\right)^4$
$-5.4-\left(-2.3\right)$
$-6\left(-8+4s\right)$
$\left(1+\sec^2\left(a\right)\right)\left(1-\sin^2\left(a\right)\right)$
$\frac{\csc\left(a\right)-\cot\left(a\right)}{\csc\left(a\right)+\cot\left(a\right)}$
$1-3-4+4$
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