$\frac{cos\left(90\right)}{cos\left(90\right)^2+sin\left(270\right)^2}$
$5a+2b=10$
$\int_3^6\sqrt{x^2+9}dx$
$2a^2^2+2ax^2-3ax$
$-1\left(2x^3+9x^2+9x+7\right)$
$\frac{4x}{x-4}x-4=\frac{16}{x-4}$
$\int_5^1\sec^23xdx$
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