Câu hỏi của CỤC CỨK BIẾT BAY

Question

Biết sin a = √3\2. Tính cos a, tan a, cot a

Alice · Accepted Answer

$sin$ $a$ $=\dfrac{\sqrt{3}}{2}\Rightarrow\widehat{a}=60^o$

$\Rightarrow cos$ $a$ $=cot$ $60^o$ $=\dfrac{1}{2}$

$tan$ $a$ $=tan$ $60^o$ $=\sqrt{3}$

$cot$ $a$ $\dfrac{1}{tana}$ $=\dfrac{1}{\sqrt{3}}$ $=\dfrac{\sqrt{3}}{\sqrt{3}}$

Câu trả lời:

$sin$ $a$ $=\dfrac{\sqrt{3}}{2}\Rightarrow\widehat{a}=60^o$

$\Rightarrow cos$ $a$ $=cot$ $60^o$ $=\dfrac{1}{2}$

$tan$ $a$ $=tan$ $60^o$ $=\sqrt{3}$

$cot$ $a$ $\dfrac{1}{tana}$ $=\dfrac{1}{\sqrt{3}}$ $=\dfrac{\sqrt{3}}{\sqrt{3}}$