Tìm đạo hàm của hàm số \(y = \tan x - \frac{1}{3}{\tan ^3}x + \frac{1}{5}{\tan ^5}x\)
\(\begin{array}{l}
y\prime = \frac{1}{{{{\cos }^2}x}} - \frac{1}{{{{\cos }^2}x}}.{\tan ^2}x + \frac{1}{{{{\cos }^2}x}}.{\tan ^4}x\\
= \frac{1}{{{{\cos }^2}x}}\left( {1 - {{\tan }^2}x + {{\tan }^4}x} \right)\\
= \left( {1 + {{\tan }^2}x} \right)\left( {1 - {{\tan }^2}x + {{\tan }^4}x} \right)\\
= 1 + {\tan ^6}x
\end{array}\)
-- Mod Toán 11
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