$-2.5^2$
$36x^4y^2-100$
$\left(3-8\right)+5^2$
$\left(4m^2n-7m\right)^2$
$\left(x-2\right)^4-\:\left(y+3\right)^4\:\:$
$\frac{cos\left(x\right)-sen\left(x\right)}{cos\left(x\right)}=1-tan\left(x\right)$
$\left(-240\right):\left(+4\right)$
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