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mathdeptv2/工具/文本文件/metadata.txt

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ans
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$1$
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$[2k\pi,2k\pi+\pi ]$, $k\in \mathbf{Z}$
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$-\dfrac{1}{2}$
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$3\pi$
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$\dfrac{59}{4}$
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$6$
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$-1$
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$\dfrac{\pi}{2}$
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$-\mathrm{i}$
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$\sqrt{2}$
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$8$
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$(-2,0)\cup (0,2)$
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D
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C
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D
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D
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(1) 当$\alpha$为第一象限角时, $f(\alpha)+g(\alpha)=\sqrt{2(1-m^2)}$; 当$\alpha$为第一象限角时, $f(\alpha)+g(\alpha)=-\sqrt{2(1-m^2)}$; (2) $\dfrac{2}{5}$
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(1) 证明略; (2) 证明略
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(1) $\hat{y}=\hat{c}+\hat{d}\ln x$更好; (2) $\hat{y}=60\ln x+12$; (3) $30$万元
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(1) 焦点为$(0,\dfrac{p}{2})$, 准线为$y=-\dfrac{p}{2}$; (2) $k=2$; (3) 证明略
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(1) $y=f_1(x)$与$y=f_2(x)$都是$\mathbf{R}$上的``平缓函数''; (2) 证明略; (3) 证明略