$\frac{1-cos\left(x\right)}{sin\left(x\right)}=\frac{tan\left(x\right)}{sec\left(x\right)+1}$
$a^2-169$
$5n^2-340n$
$7\left(2y+3\right)-4\left(3y+2\right)$
$\frac{x^3+x^2+x-1}{x+1}$
$-3^2+2\left(-3\right)$
$x^2mas\:y^2=7$
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