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Trigonometric Identities

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cscθ=
1/sinθ
secθ=
1/cosθ
cotθ=
1/tanθ
tanθ=
sinθ/cosθ
cotθ=
cosθ/sinθ
cos²θ+sin²θ=
1
1+cot²θ=
csc²θ
tan²θ+1=
sec²θ
cos(-θ)≈
cosθ
sec(-θ)≈
secθ
sin(-θ)≈
-sinθ
csc(-θ)≈
-cscθ
tan(-θ)≈
-tanθ
cos(π/2 -θ)=
sinθ
sin(π/2 -θ)=
cosθ
sec(π/2 -θ)=
cscθ
csc(π/2 -θ)=
secθ
tan(π/2 -θ)=
cotθ
cot(π/2 -θ)
tanθ