Trig Identities/Trig Sub

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9 Terms

1
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sin²x + cos²x =

1

2
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1 +tan²x

sec²x

3
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sin²x =

(1/2)(1-cos2x)

4
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cos²x =

(1/2)(1+cos2x)

5
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2sinxcosx

sin2x

6
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sqrt(a²-x²)

x = asinθ

7
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sqrt(a²+x²)

x = atanθ

8
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sqrt(x²-a²)

x = asecθ

9
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cot²x + 1 =

csc²x