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sin(x) =
opp / hyp
cos(x) =
adj / hyp
tan(x) =
sin(x) / cos(x)
(triangle) tan(x) =
opp / adj
sec(x) =
1 / cos(x)
(triangle) sec(x) =
hyp / adj
csc(x) =
1 / sin(x)
(triangle) csc(x) =
hyp / opp
cot(x) =
cos(x) / sin(x) => 1 / tan(x)
(triangle) cot(x) =
adj /opp
60, 30, 90 Triangle
45, 45, 90 Triangle
sin^2 + cos^2 =
1
sec^2 - tan^2 =
1
csc^2 - cot^2 =
1
sin(0) =
0
cos(0) =
1
sin(π/6) =
1/2
cos(π/6) =
√(3) / 2
sin(π/4) =
√(2) / 2
cos(π/4) =
√(2) / 2
sin(π/3) =
√(3) / 2
cos(π/3) =
1/2
sin(π/2) =
1
cos(π/2) =
0
Unit Circle