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ChoABC. Chứng minh : a) a= b.cosC + c.cosB b) b2 − c2 = a(b.cosC − c.cosB) c) (b2 − c2)cosA = a(c.cosC − b.cosB) d) sinC = sinA.cosB + sinB.cosA Giúp mình với ạ Mình đang cần gấp Cảm ơn nhiều ạ
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