Pythagorean identities, double angle identities, and half angle identities

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13 Terms

1
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1= (cos/cos)

sin²x+cos²x

2
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1=(sec/tan)

sec²x-tan²x

3
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1=(csc/cot)

csc²x-cot²x

4
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sin(2x)

2sinxcosx

5
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cos(2x) (first)

cos²x-sin²x

6
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cos(2x) (second)

2cos²x-1

7
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cos(2x) (third)

1-2sin²x

8
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tan(2x)

(2tanx)/(1-tan²x)

9
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sin(x/2)

sqrt(1-cosx)/2

10
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cos(x/2)

sqrt(1+cosx)/2

11
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tan(x/2) (first)

sinx/1+cosx

12
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tan(x/2) (second)

1-cosx/sinx

13
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tan(x/2) (third)

sqrt(1-cosx)/(1+cosx)