Sumd/different formulas + fund. trig identities

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Last updated 12:17 AM on 5/13/26
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26 Terms

1
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sum

2
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sin(a + b)

sin a cos b + cos a sin b

3
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cos(a + b)

cos a cos b - sin a sin b

4
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tan(a + b)

tan a + tan b/ 1- tan a tan b

5
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tan(a + b)

tan a - tan b/ 1 + tan a tan b

6
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sin(a + b)

sin a cos b - cos a sin b

7
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cos(a + b)

cos a cos b + sin a sin b

8
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reciprocal identities

9
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csc

1/sin

10
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sec

1/cos

11
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cot

1/ tan

12
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tangent/cotangent identities

13
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tan

sin/cos

14
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cot

cos/sin

15
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Pythagorean identities

16
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1

sin² + cos ²

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sec

1 + tan ²

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csc

1 + cot²

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cofunction identities

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sin (pi/a -0) =

cos 0

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cos (pi/a -0) =

sin 0

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tan (pi/a -0) =

cot 0

23
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negative angle identities

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sin(-0)=

-sin 0

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cos(-0)=

cos 0

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tan(-0)=

-tan 0