Trig Identities

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7 Terms

1
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sin(2x)

2sinxcosx

2
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cos(2x)

cos²x-sin²x
2cos²x-1
1-2sin²x

3
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Area of triangle using 1 sin value

(1/2)ab(sin(C))
(1/2)bc(sin(A))
(1/2)ac(sin(B))

4
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tan²x + 1

sec²x

5
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cot²x + 1

csc²x

6
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sin(a + b)

sin (a + b) = sin a cos b + sin b cos a

7
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cos(a + b)

cos (a + b) = cos a cos b - sin a sin b