Precalc Hnr-Trig Identities formulas

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cos^2 x + sin^2 x=

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1

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1 - sin^2 x=

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cos^2 x

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Pythagorean Identities, Sum and Difference Identities, Double Angle Identities

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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