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Câu hỏi:

A $a)sin\widehat{C}=\frac{\sqrt{2}}{\sqrt{3}};cos\widehat{C}=\frac{1}{\sqrt{3}};tg\widehat{C}=\sqrt{2};cot\widehat{C}=\frac{1}{\sqrt{2}};b)AC=6; BC=3\sqrt{6};AB=3\sqrt{2}$
B $a)sin\widehat{C}=\frac{\sqrt{2}}{\sqrt{3}};cos\widehat{C}=\frac{1}{\sqrt{3}};tg\widehat{C}=\sqrt{2};cot\widehat{C}=\frac{1}{\sqrt{2}};b)AC=6; BC=3\sqrt{2};AB=2\sqrt{3}$
C $a)sin\widehat{C}=\frac{1}{\sqrt{3}};cos\widehat{C}=\frac{\sqrt{2}}{\sqrt{3}};tg\widehat{C}=\frac{1}{\sqrt{2}};cot\widehat{C}=\sqrt{2};b)AC=6; BC=3\sqrt{6};AB=3\sqrt{2}$
D $a)sin\widehat{C}=\frac{1}{\sqrt{3}};cos\widehat{C}=\frac{\sqrt{2}}{\sqrt{3}};tg\widehat{C}=\frac{1}{\sqrt{2}};cot\widehat{C}=\sqrt{2};b)AC=6; BC=3\sqrt{2};AB=2\sqrt{3}$

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