$37+\left(-2\right)-\left(-41+\left(-2\right)\right)+23$
$3x^2-4x+1$
$\sec^2-6\sec\csc+9\csc2$
$\frac{\sin\left(x\right)}{\sec\left(x\right)}-\frac{\cos\left(x\right)}{\csc\left(x\right)}=\sin\left(x\right)\cos\left(x\right)$
$\left(-12\right)-\left(-11\right)$
$\lim_{x\to5}\frac{x^2-x-20}{\left|5-x\right|}$
$\frac{4a^2+12a}{8a^2}$
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