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Precalc
Trig Identities
18
Mathematics
11th Grade
06/09/2008
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Term
Sin (x/2)
 Definition
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Term
Cos (x/2)
 Definition
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Term
Tan (x/2)
 Definition
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Term
Tan (2x)
 Definition
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Term
Sin (2x)
 Definition
2sinxcosx
Term
Cos (2x)
 Definition
cos2x−sin2x = 1−2sin2x = 2cos2x−1
Term
Cos (x±y)
 Definition
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Term
Sin (x±y)
 Definition
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Term
Tan (x±y)
 Definition
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Term
Sin (π/2 - x)
 Definition
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Term
Cos (π/2 - x)
 Definition
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Term
Cos (π - x)
 Definition
- Cos (x)
Term
Sin (π - x)
 Definition
Sin (x)
Term
Cos (-x)
 Definition
Cos (x)
Term
Sin (-x)
 Definition
- Sin (x)
Term
Pythagorean Identities
 Definition

cos2x + sin2x = 1

1 + tan2x = sec2x

cot2x + 1 = csc2x

Term
Arithmetic Series
 Definition
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Term
Geometric Series
 Definition
An = A(r)^n

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