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replace x with a theta
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20 Terms
1
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tanθ=
sinθ/cosθ
2
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cotθ=
cosθ/sinθ
3
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cotθ=
1/tanθ
4
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cscθ=
1/sinθ
5
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secθ=
1/cosθ
6
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sin2θ+cos2θ=
1
7
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1+tan2θ=
sec2θ
8
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1+cot2θ=
csc2θ
9
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cos[π/2-θ]=
sinθ
10
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sin[π/2-θ]=
cosθ
11
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cot[π/2-θ]=
tanθ
12
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tan[π/2-θ]=
cotθ
13
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sec[π/2-θ]=
cscθ
14
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csc[π/2-θ]=
secθ
15
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sin(-θ)=
-sinθ
16
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cos(-θ)=
cosθ
17
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tan(-θ)=
-tanθ
18
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cot(-θ)=
-cotθ
19
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sec(-θ)=
sec(θ)
20
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csc(-θ)=
-cscθ