$3cot^{2}x+2\sqrt{2}sin^{2}x=(2+3\sqrt{2})cosx$
Giải phương trình: $3cot^{2}x+2\sqrt{2}sin^{2}x=(2+3\sqrt{2})cosx$
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Started By PhucLe, 23-07-2017 - 15:28
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