$\sec x+\cos^2x$
$\lim_{x\to0}\left(\frac{1-\cos\left(ax\right)}{1-\cos\left(bx\right)}\right)$
$\ln\cot x$
$\left(-5x^5y^2\right)^4$
$\frac{\sin\left(x\right)+\cos\left(x\right)}{\sec\left(x\right)+\csc\left(x\right)}$
$x\cdot2\left(2x^3-3x^2-5x+7\right)$
$t\cdot ln\left(s^{2t}\right)+8t^2$
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