$1-64n^2$
$y=\frac{2x^4sinx}{7\sqrt{secx}}$
$\int7\sin^4\left(x\right)dx$
$-\frac{1}{2}xy-\frac{8}{7}xy^3$
$a-b-a+b$
$-x^2-4x+2$
$a^2-9c^2$
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