3cosx+3\:3cosx+33cosx+3
z−9zz-9zz−9z
cos2x=0, 5cos^2x=0,\:5cos2x=0,5
=4−2(−2)+17=4-2\left(-2\right)+17=4−2(−2)+17
−8y−3y−5y-8y-3y-5y−8y−3y−5y
limx→3(x2+3x−1)\lim_{x\to3}\left(x^2+3x-1\right)x→3lim(x2+3x−1)
ddx5x−6y=4\frac{d}{dx}5\sqrt{x}-6\sqrt{y}=4dxd5x−6y=4
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