Trigonometric Identities Flashcards
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Flashcards for trigonometric identities, including reciprocal, sum and difference, Pythagorean, and double angle identities.
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9 Terms
1
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sin(a + b)
sin(a)cos(b) + cos(a)sin(b)
2
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cos(a + b)
cos(a)cos(b) - sin(a)sin(b)
3
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Pythagorean Identity
sin²(θ) + cos²(θ) = 1
4
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Pythagorean Identity (Tangent)
1 + tan²(θ) = sec²(θ)
5
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Pythagorean Identity (Cotangent)
1 + cot²(θ) = csc²(θ)
6
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sin(2a)
2sin(a)cos(a)
7
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cos(2a) version 1
cos²(a) - sin²(a)
8
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cos(2a) version 2
2cos²(a) - 1
9
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cos(2a) version 3
1 - 2sin²(a)
Note 
Flashcards (45)