$\cos\infty\cot\infty=\csc\infty-\sin\infty$
$\int\frac{12}{\sec x}dx$
$+1\frac{1}{\frac{1}{\frac{1}{+4\frac{1}{4}}}}+2+3$
$y^2-2y+6$
$2x\cos\left(x\right)-2\sin\left(x\right)$
$ax^2-ax-2a$
$\log_b\left(\frac{1}{n}\right)$
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