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Mathematics 20 Online
OpenStudy (anonymous):

What is the cofunction identity of cos t?

hartnn (hartnn):

cofunction identity of cos t is just \(\cos t = \sin (90-t)\) thats in degrees.

OpenStudy (thomas5267):

Or in radians \(\cos(t)=\sin(\pi-t)\). Or just look up Wikipedia. http://en.wikipedia.org/wiki/List_of_trigonometric_identities#Symmetry.2C_shifts.2C_and_periodicity

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