$\cos^2x\sec^2x=1$
$1-a<0$
$y''+y'+6y=0$
$\lim_{x\to0}\left(e^x+7x\right)^{\frac{9}{x}}$
$x^2y+3x+5x^5y=0$
$\left\{2^2\left[3\left(-6+8^{\frac{1}{3}}\right)+3\left(4+6\right)^2\right]+5\right\}$
$-\left(380-150-230\right)$
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