limit as x approaches 1 of-2x^2+5x+4

解答

x \to 1 lim (- 2 x^{2} + 5 x + 4)

7

求解步骤

x \to 1 lim (- 2 x^{2} + 5 x + 4)

代入值

x = 1

= - 2 \cdot 1^{2} + 5 \cdot 1 + 4

化简

= 7

\int \frac{csc ^{2} ( 2 x )}{4 - cot ( 2 x )} d x

\int sin^{2} (x) cos (n x) d x

\frac{d}{d x} (\frac{cos ( x )}{2 x})

t an g e n t f (x) = 9 - 3 x + 2 x^{2}, at x = - 6

\frac{d}{d x} (2 x - 3 x^{\frac{2}{3}})