$-k-3k$
$\frac{1}{tan^2x}+cotx\cdot tanx=csc^2x$
$x^2+16>0$
$\sqrt{12}+4senx=0$
$371.002+168.1$
$x^2+2x^3+4x^4$
$\frac{9x^{2\:}y^7}{3x^2y^7}$
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