~(a->(b∧c))
538427
809565
149503
119401
6240012
3233792
1347992
y^(3)(x) - y''(x) - 4 y'(x) - 6 y(x) = 17 e^(-x)
lim ((x^2+4)^1/2 -2)/x^2
x->0
120*x + 144*x^2
3 (9/2)
express 13cm in cm and mm
$6^{4x-1}$ = 0
$20^{2}$ - 400
