$sec^2x\:+\:csc^2x\:=\:\frac{1}{sen^2x\:\cdot\:cos^2x}\:$
$7x-3y;\:x=-2;\:y=-5$
$\left(r+3s\right)^2$
$36x^4-60x^3+25x^2$
$13-1-3$
$\left(x^2-3f\right)^2$
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