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(u²-a²)^1/2
sec(theta)
(a²-u²)^1/2
sin(theta)
(a²+u²)^1/2
tan(theta)
(1/2)-(cos(2x)/2)
sin²(x)
1-cos²x
(1/2)+(cos(2x)/2)
cos²x
1-sin²x