$\frac{y^{16}-1}{y^2+1}$
$100x^2-4y^2^2$
$\left(7^{a^2}-b\right)\left(3^a-2b\right)$
$sen^4x-cos^4x=0,\:5$
$\frac{-6a^{-2}b^5+c^3}{-2a^2b^{-5}}$
$2\cot x\sin^2x=\sin2x$
$x-9<-5$
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