$\sin\left(x\right).\cos^2\left(t\right)dx+\cos^2\left(x\right)dt=0$
$f\left(x\right)=2cos^2\left(6x\right)-cos^2\left(7x\right)-sen^2\left(7x\right)$
$\left(3\left(6\right)\right)^2+7$
$-\left(\frac{4}{9}x-\frac{2}{3}-\frac{2}{9}x^2+\frac{1}{3}x^3\right)$
$\sec\left(x\right)=\frac{\sqrt{1+\cot^2\left(x\right)}}{\cot\left(x\right)}$
$34.21\cdot01$
$\left|-4\right|+\left|15\right|+\left|11\right|$
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