$b^2-2b-24$
$-10:-5$
$\frac{\sec^2\left(x\right)-1}{\sec\left(x\right)^2}=\tan\left(x\right)\cos\left(x\right)$
$1500\cdot3$
$\frac{-x^4-x^2+7}{\left(x+1\right)\left(x^2+4\right)}$
$3x+4y=18$
$-143+132+-195$
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