Trigonometric Identities and Equations -Chapter 10

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1

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what does the cast diagram tell us?

which ratios have positive values at certain angle ranges

2

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what is the sin² equation?

sin²x+cos²x=1

3

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what is the tan equation?

sinx/cosx

4

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when do solutions to sin/cos=k exist?

when k is between -1 and 1