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Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula. (a) 2 sin(180) cos(18) (b) 2 sin(20) cos(20)

Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula. (a) 2 sin(180) cos(18) (b) 2 sin(20) cos(20)

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