∫−23(21x4)dx\int_{-2}^3\left(\frac{21}{x^4}\right)dx∫−23(x421)dx
7x+5<2x−107x+5<2x-107x+5<2x−10
4x2−3; x=24x^2-3;\:x=24x2−3;x=2
limx→1.5707963267948966(9cos(−3x)sec(−7x))\lim_{x\to1.5707963267948966}\left(9cos\left(-3x\right)sec\left(-7x\right)\right)x→1.5707963267948966lim(9cos(−3x)sec(−7x))
sin (θ )1−cos (θ )=1+cos (θ )sin (θ )\frac{\sin\:\left(\theta\:\right)}{1-\cos\:\left(\theta\:\right)}=\frac{1+\cos\:\left(\theta\:\right)}{\sin\:\left(\theta\:\right)}1−cos(θ)sin(θ)=sin(θ)1+cos(θ)
x2−4=09x^2-4=09x2−4=09
∫7x2(x2−1)2dx\int\frac{7x^2}{\left(x^2-1\right)^2}dx∫(x2−1)27x2dx
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