This trig question asks me to find an expression that describes the location of each of the following values for $y = \cos x$ where $n\in\mathbb{Z}$ and $x$ is in radians.
The question then asks for
a) $x$-intercepts b) maximum values c) minimum values
The answers to the questions
- a) tn $= \pi/2 + n\pi$, $n\in\mathbb{Z}$
- b) tn $= 2n\pi$, $n\in\mathbb{Z}$
- c) tn $= -\pi + 2n\pi$, $n\in\mathbb{Z}$
The problem with this question is I don't really understand how you can use an expression to describe those values, so I want to know how they got those answers.