Practice variation 1 of 3
Inverse trigonometric functions — Principal arccos of a known cosine
Your question
It is given that . What is ?
This practice question was inspired by Question 1 in the 2022 NSW HSC Mathematics Extension 1 examination, © NESA. It is an original TestMum variation that practises the same mathematical idea, not an official NESA question.
Before you check
- Have you stated every choice or assumption?
- Can another student follow each line?
- Did you verify the final result independently?