evaluate. write your answer in simplified, ra...

# Explanation: ## Step1: Recall cosine - value at 0 The cosine function $\cos(x)$ has a well - known value at $x = 0$. In the unit circle definition, for an angle $x$ measured counter - clockwise from the positive $x$ - axis, the $x$ - coordinate of the point on the unit circle corresponding to the angle $x$ is $\cos(x)$. When $x = 0$, the point on the unit circle is $(1,0)$. So, $\cos(0)=1$. # Answer: $1$