Toán Lớp 11: căn3 tan2x + 3=0
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Toán Lớp 11: căn3 tan2x + 3=0
Giúp e với ạ
Comments ( 1 )
\sqrt 3 \tan 2x + 3 = 0\\
\Leftrightarrow \sqrt 3 \tan 2x = – 3\\
\Leftrightarrow \tan 2x = – \sqrt 3 \\
\Leftrightarrow \tan 2x = \tan \left( { – \dfrac{\pi }{3}} \right)\\
\Leftrightarrow 2x = – \dfrac{\pi }{3} + k\pi \\
\Leftrightarrow x = – \dfrac{\pi }{6} + \dfrac{{k\pi }}{2}\,\,\,\,\left( {k \in Z} \right)
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