chứng minh đẳng thức đúng với mọi tam giác abc:
bc(b^2-c^2).cos A+ca(c^2-a^2).cos B+ab(a^2-b^2).cos C=0
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Hii mate,
please rewrite it in english...
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what is this question mate I can't understand please translate in english.
phamkhanhly2916:
oke! prove the right equation with every triangle ABC
please help me!
ok
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