$\lim_{x\to0}\left(\frac{\cos\left(3x\right)-\cos^2\left(3x\right)}{x\cdot\cos\left(3x\right)}\right)$
$42\cdot34$
$\int\left(3x^5-2\right)^{-5}\left(15x^4\right)dx$
$\log_{x^{\frac{1}{2}}}=\frac{1}{2}$
$\:\:\frac{5^3}{5^1}$
$\left(+10\right)-\left(+8\right)-\left(+4\right)-\left(-7\right)$
$sin\left(\frac{\pi}{2}-o\right)=cos\left(o\right)$
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