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))