What collective name is given to identities like sin(π/2 - x) = cos(x)?
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Cofunction identities
These identities reflect the fact that the sine of an angle is the 'complementary sine' (cosine) of its complement. This relationship stems from the two acute angles in a right triangle.
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- What is the general term for trigonometric identities such as sin(π/2 - x) = cos(x)?