Extraneous Roots is what we're doing today. It is the principle for checking trig identities by substituting your answer into your original equation, either for x or theta. "Sounds good on paper, like communism?" Not all solutions in equation are viable and that's why we do this. So an extraneous root is a solution that we get but doesn't work when checked.
We also did our third mental math today.
No new homework, just work on our old assignment (exercise 15: 1-14)
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