Cho tam giác ABC nhọn. CMR:
a) cosA.cosB.cosC <=1/8
b) BC/ sinA= AC/sinB= AB/sinC
Cho tam giác ABC nhọn. CMR: a) cosA.cosB.cosC <=1/8 b) BC/ sinA= AC/sinB= AB/sinC
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Cho tam giác ABC nhọn. CMR:
a) cosA.cosB.cosC <=1/8
b) BC/ sinA= AC/sinB= AB/sinC