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T?t C?Th? D?c L?p tenth? D?c L?p eleventh? D?c L?p 12Th? D?c L?p 6Th? D?c L?p seventh? D?c L?p 8Th? D?c L?p nineCâu 20: Thu g?n bi?u th?c $P = cosalpha + cos3alpha + cos5alpha + ldots + cosstill left( 2n – 1 correct)alpha $ v?i $n in mathbb N ^* ,alpha ne kpi remaining( k in mathbb Z suitable)$ ta ???c V?n 9 t?p one Cánh di?uT?t C?L?ch S? Và ?

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H? tr?i nghi?m, h??ng nghi?p nine SGK Ho?t ??ng tr?i nghi?m, h??ng nghi?p - K?t n?i tri th?cL?p grade.id L?p quality.id L?p grade.id Ch?n l?p h?c V?n nine t?p one Cánh di?u$frac sin2a + sin3a + sin4a cos2a + cos3a + cos4a = $$ = frac sin2a + sin4a + sin3a cos2a + cos4a + cos3a $H? tr?i nghi?m, h??ng nghi?p 3 SGK Ho?t ??ng tr?i nghi?m- K?t n?i tri

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