$cosx=-\frac{\sqrt{2}}{7}$
$\frac{x-3}{2}-\frac{2x}{3}>3$
$\frac{\left(2x^2+2y^2-x\right)}{2x^2+2y^2}$
$\sec\left(x\right)\left(1-sen\left(x\right)\right)$
$\frac{\sqrt{7}-\sqrt{3}}{\sqrt{7}-\sqrt{3}}$
$981+1293+1939$
$81m^2-90mn+25n^2$
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