1−cos2x1+2cosx+cos2x\frac{1-\cos^2x}{1+2\cos x+\cos^2x}1+2cosx+cos2x1−cos2x
x2+2x=24x^2+2x=24x2+2x=24
(3x4+9)(3x4−9)\left(3x^4+9\right)\left(3x^4-9\right)(3x4+9)(3x4−9)
dh(t2−1)+dt=h2dtdh\left(t^2-1\right)+dt=h^{2dt}dh(t2−1)+dt=h2dt
9a2+10a+19a^2+10a+19a2+10a+1
(−9)2\sqrt{\left(-9\right)}^2(−9)2
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