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Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula.(a) 2 tan(9) 1tan 2 (9) (b) 2 tan(9) 1tan 2 (9)

Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula.(a)

2 tan(9)

1tan²(9)

(b)

2 tan(9)

1tan²(9)

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