37 lines
791 B
Plaintext
37 lines
791 B
Plaintext
ans
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024730
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$\pm 2\pi$
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024731
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$(0,2]$
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024732
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$[-\dfrac{\pi}{4}+k\pi, \dfrac{\pi}{4}+k\pi]$, $k\in \mathbf{Z}$
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024733
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奇
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024734
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$\dfrac{5\pi}{6}$或$\dfrac{11\pi}{6}$
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024735
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$\{x|\dfrac{\pi}{3}+2k\pi<x<\dfrac{2\pi}{3}+2k\pi, \ k\in \mathbf{Z}\}$
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024736
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$\{9\}\cup [18,+\infty)$
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024737
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$3^{x-4}$
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024738
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\begin{tikzpicture}[>=latex, scale = 0.5]
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\draw [->] (-2,0) -- (8,0) node [below] {$x$};
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\draw [->] (0,-3) -- (0,5) node [left] {$y$};
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\draw (0,0) node [below left] {$O$};
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\draw [domain = -2:8, samples = 200] plot (\x,{3*sin(\x/pi*180+30)+1});
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\draw [dashed] (pi/3,0) --++ (0,4) -- (0,4) (4*pi/3,0) --++ (0,-2) -- (0,-2);
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\draw (pi/3,0) node [below] {$\frac{\pi}{3}$} (0,4) node [left] {$4$} (4*pi/3,0) node [above] {$\frac{4\pi}{3}$} (0,-2) node [left] {$-2$};
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\end{tikzpicture}
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