$\:\:\:y'-\left(2y-7\right)\cdot\left(5x+8\right)=0$
$\frac{\left(1+cot^2\left(x\right)\right)\left(cos^2\left(x\right)\right)}{cot^2\left(x\right)}=1$
$\left(-469\right)+71$
$x+y-4x-6y$
$7x^2-8x+3=0$
$17\:+21+\:18\:+27+\:17+\:21+\:20\:+22\:+18+\:23$
$\frac{\tana\left(1+\cot^{2}a\right)}{1+\tan^{2}a}$
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