limx→π4(9tan(x)−9cot(x)x−π4)\lim_{x\to\frac{\pi}{4}}\left(\frac{9tan\left(x\right)-9cot\left(x\right)}{x-\frac{\pi}{4}}\right)x→4πlim(x−4π9tan(x)−9cot(x))
x3−13x3-1^3x3−13
sin2x+5sinx+4\sin^2x+5\sin x+4sin2x+5sinx+4
(1+tan(x))2=1+2tan(x)+tan2(x)\left(1+tan\left(x\right)\right)^2=1+2tan\left(x\right)+tan^2\left(x\right)(1+tan(x))2=1+2tan(x)+tan2(x)
4y+2+10x4y+2+10x4y+2+10x
y2−6y>−10y^2-6y>-10y2−6y>−10
1+2⋅51+2\cdot51+2⋅5
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