AP PRECALC TRIG IDENTITIES

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19 Terms

1
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CSC= 1/cos

reciprocal identity

2
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SEC= 1/cos

reciprocal identity

3
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COT=1/tan

reciprocal identity

4
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cos= 1/sec

reciprocal identity

5
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sin= 1/csc

reciprocal identity

6
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tan=1/cot

reciprocal identity

7
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tan= sin/cos

quotient identities

8
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cot= cos/sin

quotient identities

9
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sin² + cos² =1

Pythagorean identities

10
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tan² + 1= sec²

Pythagorean identities

11
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1 + cot² = csc²

Pythagorean identities

12
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sin(a+b)= sinAcosB=cosAsinB

sum and difference formulas

13
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sin(a-b)= sinAcosB-cosAsinB

sum and difference formulas

14
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cos(a+b)= cosAcosB-sinAsinB

sum and difference formulas

15
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cos(a-b)=cosAcosB+sinAsinB

sum and difference formulas

16
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sin2=2sincos

double angle formulas

17
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Cos2= cos² - sin²

double angle formulas

18
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cos2=1 - 2sin²

double angle formulas

19
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cos2= 2cos² - 1

double angle formulas