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No way... Has to be a typo... The author should be behind bars for putting wrong information in a textbook! xdYeah it's bad the questions aren't that good and it even has wrong content. The book said cos^-1 x = secx I think which is clearly wrong
Just use the Pender and/or Fitzpatrick textbooks (if you have access to them).Is math in focus a bad book, I have heard quite negative reviews of it from my teacher and year 12 friends, what are some good maths book