x2+x−20x−4\frac{x^2+x-20}{x-4}x−4x2+x−20
sec2a−sec2a⋅sin2asec^2a-sec^2a\cdot sin^2asec2a−sec2a⋅sin2a
49x4+16y4−56x2y2−z249x^4+16y^4-56x^2y^2-z^249x4+16y4−56x2y2−z2
5= 11 + x5=\:11\:+\:x5=11+x
x2−8x+13=0x^2-8x+13=0x2−8x+13=0
48x2+120x+7548x^2+120x+7548x2+120x+75
limx→0(xeln(x+1))\lim_{x\to0}\left(\frac{xe}{ln\left(x+1\right)}\right)x→0lim(ln(x+1)xe)
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