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Reciprocal
sinθ =
1/cscθ
Reciprocal
cosθ =
1/secθ
Reciprocal
tanθ =
1/cotθ
Quotient
tanθ =
sinθ/cosθ
Quotient
cotθ =
cosθ/sinθ
Pythagorean
sin²θ + ____ = 1
cos²θ
Pythagorean
1 + ____ = sec²θ
tan²θ
Even-Odd
sin(-θ) =
-sinθ
Even-Odd
cos(-θ) =
cosθ
Even-Odd
tan(-θ) =
-tanθ
Even-Odd
csc(-θ) =
-cscθ
Even-Odd
sec(-θ) =
secθ
Even-Odd
cot(-θ) =
cotθ
Confunction
sin(90°- θ) =
cosθ
Confunction
cos(90°- θ) =
sinθ
Confunction
tan(90°- θ) =
cotθ
Confunction
csc(90°- θ) =
secθ
Confunction
sec(90°- θ) =
cscθ
Confunction
cot(90°- θ) =
tanθ
90° also equals
π/2 (pi over 2)