5x2+23x+16x+4\frac{5x^2+23x+16}{x+4}x+45x2+23x+16
log20(−3x−1)=log20(−4x−4)\log_{20}\left(-3x-1\right)=\log_{20}\left(-4x-4\right)log20(−3x−1)=log20(−4x−4)
11n2−9−2n−9n11n^2-9-2n-9n11n2−9−2n−9n
(7x2+y)2\left(7x^2+y\right)^2(7x2+y)2
limx→−34x2+x+3x2+9\lim_{x\to-3}\frac{4x^2+x+3}{x^2+9}x→−3limx2+94x2+x+3
5a+1−5a5a−1\frac{5^{a+1}-5^a}{5^{a-1}}5a−15a+1−5a
2cos2θ −1=1−2sin2θ2cos^2\theta\:-1=1-2\sin^2\theta2cos2θ−1=1−2sin2θ
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