cho tam giác ABC có 3 góc nhọn AB=c; AC=b, chứng minh:
a) \(\dfrac{SinA}{SinB}=\dfrac{a}{b}\)
b)\(\dfrac{a}{SinA}=\dfrac{b}{SinB}=\dfrac{c}{SinC}\)
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15 tháng 6 2022
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