math formulas

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17 Terms

1
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sinx =

1/cscx

2
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cosx =

1/secx

3
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(trig reciprocal) tanx =

1/cotx

4
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cscx =

1/sinx

5
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secx =

1/cosx

6
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cotx =

1/tanx

7
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(not over cot) tanx =

sinx/cosx

8
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(not over tan) cotx =

cosx/sinx

9
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sin2x =

2sinxcosx

10
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cos2x =

cos²x - sin²x, 2cos²x-1, 1-2sin²x

11
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sin(a+b) =

sinacosb+cosasinb

12
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sin(a-b) =

sinacosb - cosasinb

13
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cos(a+b) =

cosasinb + sinacosb

14
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cos(a-b) =

cosasinb - sinacosb

15
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1 =

cos²x+sin²x

16
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(identity) sec²x =

1+tan²x

17
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(identity) csc²x =

cot²x+1