$\frac{2^{n+1}}{3^n}$
$9a-12b+2a-11b$
$\int kdx$
$\left(\sec\left(x\right)-1\right)\left(\sec\left(x\right)+1\right)=\tan\left(x\right)^2$
$-26450-1256$
$\frac{2x^4+2x-3}{x^2+2x}$
$7sec\left(x\right)csc\left(x\right)=14csc\left(x\right)$
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