PRECALC - Study Double Angle Identities

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9 Terms

1
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cos NUMBER 1

cos² A - sin² A

2
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COS NUMBER 2

1-2sin^2A

3
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COS NUMBER 3

2 cos² A - 1

4
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SIN

2 sin A cos A

5
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TAN

(2 tan A) / (1- tan² A)

6
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TAN

SIN/COS

7
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csc

1/sin

8
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sec

1/cos

9
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cot

cos/sin = 1/tan