Precalc Trig Identities
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Unit 5
Last updated 2:51 AM on 3/19/26
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16 Terms
1
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pythagoreon sin cos
sin²x+cos²x=1
2
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pythagorean tan sec
1+tan²x=sec²x
3
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pythagorean cot csc
1+cot²x=csc²x
4
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sin(2x)
2sinxcos
5
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cos(2x) duo
cos²x-sin²x
6
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cos(2x) sin
1-2sin²x
7
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cos(2x) cos
2cos²x-1
8
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tan(2x)
(2tanx)/(1-tan²x)
9
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sin²x
(1-cos(2x))/2
10
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cos²x
(1+cos(2x))/2
11
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tan²x
(1-cos(2x))/(1+cos(2x))
12
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sin(x/2)
+-sqrt[(1-cosx)/2]
13
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cos(x/2)
+-sqrt[(1+cosx)/2]
14
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tan(x/2) duo
+-sqrt[(1-cosx)/(1+cosx)]
15
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tan(x/2) sintop
sinx/(1+cosx)
16
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tan(x/2) sindown
(1-cosx)/sinx
