$\frac{\sin\left(u\right)}{\cos\left(u\right)}+\frac{\cos\left(u\right)}{\sin\left(u\right)}$
$36c^2+84c+49$
$\left(a+b\right)^2=24$
$-4\cdot\left(x-6\right)=20$
$\left(4x+9c^4\right)^2$
$54^2y^3-18xy^2+36x^3y^5$
$1a\:+\:1a$
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