ch5

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15 Terms

1
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sin²ø + cos² ø

= 1

2
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1 + tan²ø

= sec²ø

3
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1 + cot²ø

= csc²ø

4
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sin(a+b)

sina•cosb + cosa•sinb

5
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cos(a+b)

cosa•cosb - sina•sinb

6
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tan(a+b)

tana + tanb / 1-tana•tanb

7
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sin(a-b)

sina•cosb - cosa•sinb

8
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cos(a-b)

cosa•cosb + sina•sinb

9
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tan(a-b)

tana - tanb / 1 + tana•tanb

10
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sin(2a)

2sina•cosa

11
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cos(2a)

cos²a - sin² , a=1-2sin² , a=2cos²a-1

12
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tan(2a)

2tana / 1-tan²a

13
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sin a/2

+- square root 1-cosa/2

14
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cosa/2

+-square root 1+cosa/2

15
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tana/2

sina/1+cosa