Question: Find the exact value of the trigonometric function at the given real number. (a) cos /4 (b) cos 3/4 (c) cos 5/4 Find the exact

Find the exact value of the trigonometric function at the given real number. (a) cos /4

(b) cos 3/4

(c) cos 5/4

Find the exact value of the trigonometric function at the given real number. (a) sin 9/4

(b) sin 7/4

(c) sin 3/4

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