Cofunction identities help us to solve for trig functions of an angle related to the angle we know information about. The following are cofunction identities: = sin(t) = cos(-t) (c) tan(t) = cot(t) (d) cot(t) =tan(t) (e) csc(t) (f) sec(t) (a) cos(t) (b) sin(t) = = sec( t) csc( t) The term-t is called the complement of the angle. Using these identities, complete the following. (a) If sin(t) = , determine cos(-t).

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Q: Consider the angle t defined by on the unit circle. y TO IND (3) I

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