$\frac{\cot^2\left(x\right)}{\csc\left(x\right)}+\sin\left(x\right)$
$\frac{b^7+1}{b^7-1}$
$\int\frac{x}{x^2+3x}\:dx$
$\frac{1+\tan\:^2\left(30\right)}{\sec^2\left(30\right)}=1$
$x^4y^5+ax^3+bx^2$
$\frac{18x^5+2x^434x^3-46x^2+14x}{-4x}$
$250+70x>1200$
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