Trig Identities

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11 Terms

1
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sin²(θ)+cos²(θ)

1

2
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1+tan²(θ)

sec²(θ)

3
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cot²(θ)+1

csc²(θ)

4
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sin(2x)

2sin(x)+cos(x)

5
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cos(2x) (= 2 things…)

cos²(x)-sin²(x)=1-2sin²(x)

6
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cos²(x)

½(1+cos(2x))

7
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sin²(x)

½(1-cos(2x))

8
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tan(θ)

sin(θ)/cos(θ)

9
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cot(θ)

cos(θ)/sin(θ)

10
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csc(x) (= 2 things…)

1/sin(x) OR sin(x)csc(x)=1

11
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sec(x) (= 2 things…)

1/cos(x) OR cos(x)sec(x)=1