Can someone explain this a little better and reccommend a graph. Answer quickly due Friday :).
2 answers:
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By using the definition of the inverse cosine function, we will see that:
<h3>How to complete the expression?</h3>
We have the expression:
Remember that if:
Then, in what do we need to evaluate the cosine function to get an output equal to zero?
Then:
Then we can replace the question sign with a 2.
If you want to learn more about the cosine function, you can read: