Trigonometry summer revision

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Last updated 2:39 PM on 8/1/26
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16 Terms

1
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cos(-x)

cos(x)

2
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sin(-x)

-sin(x)

3
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cos(x+π/2)

-sin(x)

4
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sin(x+π/2)

cos(x)

5
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cos(π/2-x)

sin(x)

6
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sin(π/2-x)

cos(x)

7
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cos(x+π)

-cos(x)

8
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sin(x+π)

-sin(x)

9
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cos(a+b)

cos(a)cos(b) - sin(a)sin(b)

10
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cos(a-b)

cos(a)cos(b) + sin(a)sin(b)

11
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sin(a+b)

sin(a)cos(b) + cos(a)sin(b)

12
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sin(a-b)

sin(a)cos(b) - cos(a)sin(b)

13
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cos(2x)

cos2(x) - sin2(x)

14
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cos(2x)

2cos2(x) - 1

15
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cos(2x)

1 - 2sin2(x)

16
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sin(2x)

2sin(x)cos(x)