Toán Lớp 11: Giúp e với ạ : cotg(x- π/2)= cotg (2x+1)
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Toán Lớp 11: Giúp e với ạ : cotg(x- π/2)= cotg (2x+1)
Comments ( 2 )
\cot \left( {x – \frac{\pi }{2}} \right) = \cot (2x + 1)\\
dk:\,\sin \left( {x – \frac{\pi }{2}} \right) \ne 0\\
\sin (2x + 1) \ne 0\\
\Leftrightarrow x \ne \frac{\pi }{2} + k\pi \\
\,\,\,\,\,\,\,x \ne \frac{{k\pi – 1}}{2}\\
\Leftrightarrow x – \frac{\pi }{2} = 2x + 1 + k\pi \\
\Leftrightarrow \,x = \frac{{ – \pi }}{2} – 1 – k\pi
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