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sinθ
cosθ
tanθ
cscθ
secθ
cotθ
Pythagorean Identity of Trig
Pythagorean Identity ➗ cos2θ
Pythagorean Identity ➗ sin2θ
cos(-θ) = ? even or odd
sin(-θ) = ? even or odd
tan(-θ) = ? even or odd