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sin²(θ) + cos²(θ)=
1
1 + tan²(θ)=
sec²(θ)
1+ cot²(θ)=
csc²(θ)
sec(θ)=
1/cos(θ)
csc(θ)=
1/sec(θ)
cot(θ)=
1/tan(θ)