4. Use the trigonometric identities to find the exact value of each expression. 1 a. cos(216°) cos(546°)+sin(216°) sin(5
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4. Use the trigonometric identities to find the exact value of each expression. 1 a. cos(216°) cos(546°)+sin(216°) sin(5
4. Use the trigonometric identities to find the exact value of each expression. 1 a. cos(216°) cos(546°)+sin(216°) sin(546) 117 b. sin (12) - sin (- 5
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