$y^2=\sec\left(2x\right)$
$2x+1=x-8$
$\cot^2a+\csc^2a=-\cot^4a-\csc^4a$
$x^3-x^5-x$
$3y^2-15x^2+8x^2-5y^2$
$4a^2-4a$
$\frac{4.9}{3.4\:}=\frac{39.2}{30.6}$
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