$\sin^2\left(y\right)\csc^2\left(y\right)=\sin^2\left(y\right)+\csc^2\left(y\right)$
$2\cdot\left(3-5\right)^3+1$
$\cos^2x-\sin^2x=\cos x$
$\frac{1}{\frac{1}{y-4}+\frac{1}{y-3}}$
$\frac{x^3+8}{x^2+4}$
$5.7\cdot10^4$
$\frac{5x^2+32x+39}{x+5}$
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