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∵ (5 / 2)π < a < (11 / 4)π∴ 5 π < 2a < (11 / 2)π∵ sin 2a = - 4 / 5 ∴ cos 2a = - 3 / 5∴ cos ² a - sin ² a = - 3 / 5(cos ² a - sin ² a)/ (sin ² a + cos ² ...
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