What is the sum from n=1 to infinity of cos(2n) ?

The sum from n=1 to infinity of cos(2n) is diverges

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sum from n=1 to infinity of cos(2n)

n = 1 \sum \infty cos (2 n)

diverges

Solution steps

n = 1 \sum \infty cos (2 n)

Apply Series Divergence Test:

diverges

= diverges

y = x^{2} - 1, y = x + 2, x = 0, x + 1

x \to - 1 lim (5 - 3 x - x^{2})

(3.1) (0)

\frac{d}{d x} ((x^{3} + 1)^{2})

y = (4 - 3 x^{2})^{3}

What is the sum from n=1 to infinity of cos(2n) ?
The sum from n=1 to infinity of cos(2n) is diverges