11th grade

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22 Terms

1
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Sin-1 A + Sin-1 B=

Sin-1[A √1 - B² + B √1 - A²]

2
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Sin-1 A - Sin-1B=

Sin-1 [A√1-B2 - B√1-A2]

3
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Cos-1A + Cos-1B=

Cos-1 [AB - √(1-A2)(1-B2)]

4
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Cos-1A - Cos-1B=

Cos-1 [AB + √(1-A-2)(1-B-2)]

5
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Tan-1A + Tan-1B=

Tan-1 A+B/1-AB

6
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Tan-1A - Tan-1B=

Tan-1 A-B/1+AB

7
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2Tan-1A=

Tan-1 2A/1-A2

8
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A2=

B2 + C2 - 2BC CosA

9
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B2=

A2 + C2 - 2AC CosB

10
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C2=

A2 + B2 - 2AB CosC

11
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Sin (A+B)=

SinA CosB + CosA SinB

12
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Sin (A-B)=

SinA CosB - CosA SinB

13
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Cos (A+B)=

CosA CosB - SinA SinB

14
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Cos (A-B)=

CosA CosB + SinA SInB

15
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Sin(A+B) + Sin(A-B)=

2SinA CosB

16
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Sin(A+B) - Sin(A-B)=

2CosA SinB

17
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Cos(A+B) + Cos(A-B)=

2CosA CosB

18
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Cos(A+B) - Cos(A-B)=

-2SinA SinB

19
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SinP + SinQ=

2Sin P+Q/2 Cos P-Q/2

20
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SinP - SinQ=

2Cos P+Q/2 Sin P-Q/2

21
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CosP + SinQ=

2Cos P+Q/2 Cos P-Q/2

22
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CosP - SinQ=

-2Sin P+Q/2 Sin P-Q/2