(a−19)(a+19)\left(a-\frac{1}{9}\right)\left(a+\frac{1}{9}\right)(a−91)(a+91)
dydx=e24y\frac{dy}{dx}=\frac{e^2}{4y}dxdy=4ye2
42⋅434^2\cdot4^342⋅43
(−1)n+1((x+1)n22n−1)\left(-1\right)^{n+1}\left(\frac{\left(x+1\right)^n}{2^{2n-1}}\right)(−1)n+1(22n−1(x+1)n)
dy+(xy−cosx)dx=0dy+\left(xy_-\cos x\right)dx=0dy+(xy−cosx)dx=0
1cos(x2)2\frac{1}{\cos\left(\frac{x}{2}\right)^2}cos(2x)21
x3−2x2+x+6. 2x−4x^3-2x^2+x+6.\:2x-4x3−2x2+x+6.2x−4
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