Trigonometry revisions - boards
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Last updated 1:06 PM on 10/8/23
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23 Terms
1
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Rad to D
2
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squred
3
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Cos (x+y)
cosx cosy - sinx siny
4
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cos (x-y)
cosx cosy - sinx siny
5
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sin(x+y)
sinx cosy + cosx siny
6
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sin (x-y)
sinx cosy - cosx siny
7
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tan (x + y)
tanx +tan y
1- tanx tany
8
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tan (x-y)
tanx-tany
1+tanx tany
9
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cot(x+y)
cotx coty-1
coty +cotx
10
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cot (x-y)
cotx coty +1
coty - cotx
11
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cos2x
cos²x-sin²x 2cos² x -1 1- 2sin² x 1- tan² x
1+ tan²x
12
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sin2x
2sin x cos x. 2tanx
1+ tan² x
13
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tan 2x
2 tanx
1+ tan² x
14
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sin 3x
3sinx - 4 sin³ x
15
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cos 3 x
4 cos³ x - 3 cos x
16
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tan 3x
3tanx - tan³ x
1-3 tan² x
17
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cosx + cos y
cosx- cosy
Sinx + siny
sinx - siny
18
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cos(x+y) +cos(x-y)
cos(x+y) -cos(x-y)
sin(x+y) + cos(x-y)
sin(x+y) - cos(x-y)
19
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General
20
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Sin ratios
21
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Derivation
22
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Imp
23
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B
