The trigonometric function of the complement of an angle or arc.
- Similarly, tan x and cot x are cofunctions of each other, and sec x and csc x are cofunctions of each other.
- Students will be able to use reciprocals, quotients, Pythagorean identities, cofunctions, and composite-arguments to prove trig identities.
- The question wants an angle less than 45º, so we use our cofunctions.
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