TRIG IDENTITIES - AP pre calc

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12 Terms

1
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sin squared theta + cos square theta is…

1

2
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tan squared theta +1 is…

sec squared theta

3
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1 + cot squared thea is…

csc squared theta

4
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sin (-theta) is…

-sin (theta)

5
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cos (-theta) is…

cos (theta)

6
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cot (-theta) is…

-cot (theta)

7
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sin (alpha + beta) is…

sin (alpha) x sin (beta) + cos (alpha) x sin (beta)

8
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cos (alpha + beta) is…

cos (alpha) x cos (beta) - sin (alpha) x sin (beta)

9
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tan (alpha + beta) is…

(tan (alpha) + tan (beta))/(1-tan (alpha) tan (beta))

10
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sin (2 theta) is…

2 sin (theta) x cos (theta)

11
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cos (2 theta) is either (3 WAYS!!!)…

cos squared theta - sin squared theta, 2 cos squared (theta) - 1, or 1 - 2(sin squared theta)

12
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tan (2 theta) is…

(2 tan theta)/(1 - tan squared theta)