Calculus Examples

$\sum_{k = 2}^{6} \cos (k π)$

Step 1

Expand the series for each value of $k$ .

$\cos (2 π) + \cos (3 π) + \cos (4 π) + \dots + \cos (6 π)$

Step 2

Simplify the expanded form.

$1$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$