Basic forms Egley Trig Identities

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Symbol needed: θ a = α b = β

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9 Terms

1
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sin²(θ)+cos²(θ)=

1

2
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tan²(θ)+1=

sec²(θ)

3
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tan²(θ)=

sec²(θ)-1

4
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sin(a+b)=

sin(a)cos(b)+cos(a)sin(b)

5
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cos(a+b)=

cos(a)cos(b)-sin(a)sin(b)

6
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sin(2a)=

2sin(a)cos(a)

7
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cos(2a)=

cos²(a)-sin²(a)

8
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sin²(θ)=

1/2(1-cos(2θ))

9
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cos²(θ)=

1/2(1+cos(2θ))