Precalc Hnr-Trig Identities formulas
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Pythagorean Identities, Sum and Difference Identities, Double Angle Identities
Last updated 11:45 PM on 12/5/22
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26 Terms
1
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cos^2 x + sin^2 x=
1
2
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1 - sin^2 x=
cos^2 x
3
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( 1- sin x)(1+ sin x)
cos^2 x
4
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1 - cos^2 x=
sin ^2 x
5
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(1- cos x)(1+cos x)
sin^2 x
6
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1 + tan^2 x=
sec^2 x
7
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sec^2 x- tan^2 x=
1
8
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(sec x - tan x)(sec x + tan x)=
1
9
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tan^2 x-sec^2 x=
-1
10
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(tan x- sec x)(tan x + sec x)=
-1
11
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1 + cot^2 x =
csc^2 x
12
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csc^2 x - cot^2 x=
1
13
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(Csc x - cot x)(csc x+ cot x)=
1
14
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cot^2 x - csc^2 x=
-1
15
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(cot x- csc x)(cot x+csc x)=
-1
16
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sin(A+B)=
(sin A)(cos B) + (sin B)(cos A)
17
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sin(A-B)
(sin A)(cosB)-(Sin B)(Cos A)
18
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cos(A+B)
(cos A)(cos B)- (sinA)(sinB)
19
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cos(A-B)
(cos A)(cos B) + (sin A)(Sin B)
20
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tan(A-B)
tan A - tan B/1+ (tan A)(tan B)t
21
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tan(A+B)
tan A + tan B/ 1-(tan A)(tan B)
22
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sin(2x)
2(sin x)(cos x)
23
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cos(2x)
cos^2 x- sin^2 x
24
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cos(2x)
2 cos^2 x-1
25
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cos(2x)
1-2(sin^2 x)
26
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tan(2x)
2(tan x)/1-tan^2 x
Note 
Flashcards (25)