Question

2. Solve (and show your work) using the inverse cosine function:cos(x) = 0.4for at least one angle x.

Answer 1

ANSWER

$x=66.4^o$

EXPLANATION

We want to use the inverse cosine function to find the value of x.

If the cosine of an angle is:

cos(x) = a

then, the inverse cosine function is:

$\cos ^{-1}(a)\text{ = x}$

So, we have that:

$\begin{gathered} \cos ^{-1}(0.4)\text{ = x} \\ \Rightarrow x=66.4^o \end{gathered}$

That is the answer.