Toán Lớp 9: Cho Tan a=3. Khi đó Cota bằng.
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Toán Lớp 9: Cho Tan a=3. Khi đó Cota bằng.
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$\text{Sử dụng tan a = cot a . 1}$
$\text{⇒ Ta có:}$ cot a = 1/ tan a = 1/3