Toán Lớp 9: Tìm cos a,tan a,cot a.Biết sin a=1/5
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Toán Lớp 9: Tìm cos a,tan a,cot a.Biết sin a=1/5
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{\sin ^2} + {\cos ^2}a = 1\\
\Rightarrow \cos a = \frac{{2\sqrt 6 }}{5}\\
\tan a = \frac{{\sin a}}{{\cos a}} = \frac{{\sqrt 6 }}{{12}}\\
\cot a = \frac{{\cos a}}{{\sin a}} = 2\sqrt 6
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