Algebra II trig honors ch 15 formulas

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all these are in the 15.6 notes for kreuger

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20 Terms

1
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tan²x+1

sec²x

2
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1+cot²

csc²x

3
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cos(-x)

cosx

4
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sin(x1+x2)

sinx1cosx2+sinx2cosx1

5
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sin(x1-x2)

sinx1cosx2-sinx2cosx1

6
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cos(x1+x2)

cosx1cosx2-sinx1sinx2

7
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cos(x1-x2)

cosx1cosx2+sinx1sinx2

8
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tan(x1+x2)

(tan x1 + tan x2) / (1 - tan x1 tan x2).

9
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tan(x1-x2)

(tan x1 - tan x2) / (1 + tan x1 tan x2)

10
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sin2x

2sinxcosx

11
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cos2x

cos^2 x - sin^2 x

12
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cos2x

2cos²x-1

13
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cos2x

1-2sin²x

14
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tan2x

2tanx/1-tan²x

15
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sin x/2

+-√((1-cos x)/2)

16
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cos x/2

+-√((1+cos x)/2)

17
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tan x/2

+−√((1−cos x)/(1+cos x))

18
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tan x/2

sinx/1+cosx

19
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law of cosines

a²=b²c²-2bc cosA

20
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law of sines

sinA/a= sinB/b = sinC/c