sum from n=0 to infinity of tan(n)

解答

n = 0 \sum \infty tan (n)

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求解步骤

n = 0 \sum \infty tan (n)

使用级数发散判别法:

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= 发散

\int \frac{csc ^{2} ( 2 x )}{cot ^{5} ( 2 x )} d x

x \to 1 lim (\frac{8 x + 1}{x + 3})

s l o p e in t erce pt (- 3, 2), (- 1, - 1)

d er i v a t i v e x x^{2} + 9

y^{^{''}} + 2 y^{^{'}} + 10 y = 0, y (0) = 3, y^{^{'}} (0) = - 1