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15. Find the exact value of the following expression. To receive credit, create circle and triangle diagrams. Simplify the expression fully. cos sin 9) +

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15. Find the exact value of the following expression. To receive credit, create circle and triangle diagrams. Simplify the expression fully. cos sin" 9) + cot 2 16. Use the information given below to find the exact value of (a) sin and (b) cos(20) , where 030

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