$\frac{\left(secx+1\right)}{tanx}=cscx$
$24^{12}$
$\lim_{x\to-4}\left(\frac{\sqrt{x^2+9}-5}{x-4}\right)$
$+424+43$
$f\left(x\right)=\sqrt{-2^2}-4$
$\int sin6xsin4xdx$
$7a-8b-15a+a+b-4c$
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