单词	cofunction
释义	cofunction /ˈkōˌfəNG(k)SH(ə)n / noun Mathematics 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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