Maths identities

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12 Terms

1
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sin² or cos²

sin²x+cos²x=1

2
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sin x/cos x

sin x/cos x = tan x

3
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sec x

sec x = 1/cos x

4
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cosec x

cosec x = 1/sin x

5
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cot x

cot x = 1/tan x

6
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sec²x

sec²x = 1 + tan²x

7
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cosec²x

1 + cot²x

8
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sin 2x

sin 2x = 2sinxcosx

9
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cos 2x

cos 2x = cos²x - sin²x

10
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cos 2x

1 - 2sin²x

11
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cos 2x

2cos²x-1

12
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tan 2x

2tan x / 1-tan²x