泰勒 sqrt(1-x^2),x=0

解答

泰勒

1 - x^{2}, x = 0

1 - \frac{1}{2} x^{2} - \frac{1}{8} x^{4} - \frac{1}{16} x^{6} - \frac{5}{128} x^{8} + \dots

求解步骤

应用泰勒公式

= 1 + \frac{\frac{d}{d x} ( 1 - x ^{2} ) ( 0 )}{1 !} x + \frac{\frac{d ^{2}}{d x ^{2}} ( 1 - x ^{2} ) ( 0 )}{2 !} x^{2} + \frac{\frac{d ^{3}}{d x ^{3}} ( 1 - x ^{2} ) ( 0 )}{3 !} x^{3} + \dots

求导数

= 1 + \frac{0}{1 !} x + \frac{- 1}{2 !} x^{2} + \frac{0}{3 !} x^{3} + \frac{- 3}{4 !} x^{4} + \frac{0}{5 !} x^{5} + \frac{- 45}{6 !} x^{6} + \frac{0}{7 !} x^{7} + \frac{- 1575}{8 !} x^{8} + \dots

整理后得

= 1 - \frac{1}{2} x^{2} - \frac{1}{8} x^{4} - \frac{1}{16} x^{6} - \frac{5}{128} x^{8} + \dots

\frac{d}{d x} (\frac{x ^{2}}{3 + 8 x})

x \cdot y^{^{'}} + y^{2} = 0

\int 5 + 4 x - x^{2} d x

\int \frac{6}{x ^{6}} d x

\frac{d}{d x} (1 - \frac{4}{x ^{2}})