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Mathematics 18 Online
OpenStudy (anonymous):

http://k003.kiwi6.com/hotlink/7737o219bm/precalc_ch4_no18_text.png Please explain this to me. Here's my answer ("sort of", BS): http://k003.kiwi6.com/hotlink/se9i63s338/precalc_ch4_no18.jpg How can the textbook say that in their answer? Please just help me to make some sense of this, it seems simple enough...

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