Let’s look at how to use trigonometric identities to calculate missing sides. \({sin~θ} = \frac {opposite} {hypotenuse}\) \({cos~θ} = \frac {adjacent} {hypotenuse ...

This is a preview. Log in through your library . Abstract The four series $$\sum^\infty_0 \sin(2k + 1)\alpha/(2k + 1)^2, \quad\sum^\infty_0 \cos(2k + 1)\alpha/(2k + 1 ...