$\frac{sinx}{1-cos^2x}=cscx$
$\int_0^{\pi}5sen\left(nx\right)dx$
$2^2\cdot\frac{1}{\frac{1}{2^{-1}}}$
$y^2-10y+49$
$4a^3+6a^2b-2ab^4$
$\left(4\right)\left(5\right)-\left(3\right)\left(2\right)$
$k^2-2k$
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