$16a+24+9$
$\frac{\sec\left(a\right)^2}{1+cot^2a}=\tan\left(a\right)^2$
$\frac{1+sec\left(-x\right)}{sin\left(-x\right)+tan\left(-x\right)}=-csc\left(x\right).$
$\left(2b^2\right)\left(-3\right)$
$\frac{13}{12}xy+5z$
$7x^2-3x-1=0$
$4a+3c-2b+5a+7b-8c$
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