Precalc ID's
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Last updated 3:07 PM on 3/23/26
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9 Terms
1
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Quotient ID’s
tanx=sinx/cosx
cotx=cosx/sinx
2
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Pythagorean ID
cos²x+sin²x=1
3
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Sum ID →cos(a+b)
cosa x cosb - sina x sinb
4
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Difference ID → cos(a-b)
cosa x cosb + sina x sinb
5
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Sum ID → sin(a+b)
sina x cosb + sinb x cosa
6
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Difference ID → sin(a-b)
sina x cosb - sinb x cosa
7
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Double Angle ID → sin(2a)
2sinacosa
8
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Double Angle ID → cos(2a)
cos²a - sin²a
1-2sin²a
2cos²a-1
9
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Reciprocal Pythagorean ID
csc² x- cot²x=1
sec²x-tan²x=1
