优优班--学霸训练营 > 知识点挑题
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            • 1.
              设数列\(\{a_{n}\}\)是首项为\(0\)的递增数列,\(f_{n}(x)=|\sin \dfrac {1}{n}(x-a_{n})|\),\(x∈[a_{n},a_{n+1}]\),\(n∈N^{*}\),满足:对于任意的\(b∈[0,1)\),\(f_{n}(x)=b\)总有两个不同的根,则\(\{a_{n}\}\)的通项公式为 ______ .
            • 2. 下列函数为奇函数的是\((\)  \()\)
              A.\(y= \sqrt {x}\)
              B.\(y=|\sin x|\)
              C.\(y=\cos x\)
              D.\(y=e^{x}-e^{-x}\)
            • 3.
              已知函数\(f(x)=2\sin (2x+ \dfrac {π}{4})+2\cos ^{2}(x+ \dfrac {π}{8})-1\),把函数\(f(x)\)的图象向右平移\( \dfrac {π}{8}\)个单位,得到函数\(g(x)\)的图象,若\(x_{1}\),\(x_{2}\)是\(g(x)-m=0\)在\([0, \dfrac {π}{2}]\)内的两根,则\(\sin (x_{1}+x_{2})\)的值为\((\)  \()\)
              A.\( \dfrac {2 \sqrt {5}}{5}\)
              B.\( \dfrac { \sqrt {5}}{5}\)
              C.\(- \dfrac { \sqrt {5}}{5}\)
              D.\(- \dfrac {2 \sqrt {5}}{5}\)
            • 4.
              已知函数\(f(x)=\sin (ωx+ϕ)\) \((ω > 0,0 < ϕ < \dfrac {π}{2})\),\(f(x_{1})=1\),\(f(x_{2})=0\),若\(|x_{1}-x_{2}|_{min}= \dfrac {1}{2}\),且\(f( \dfrac {1}{2})= \dfrac {1}{2}\),则\(f(x)\)的单调递增区间为\((\)  \()\)
              A.\([- \dfrac {1}{6}+2k, \dfrac {5}{6}+2k],k∈Z\)
              B.\([- \dfrac {5}{6}+2k, \dfrac {1}{6}+2k],k∈Z\).
              C.\([- \dfrac {5}{6}+2kπ, \dfrac {1}{6}+2kπ],k∈Z\)
              D.\([ \dfrac {1}{6}+2k, \dfrac {7}{6}+2k],k∈Z\)
            • 5.
              已知函数\(f(x)= \sqrt {3}\sin 2x+2\cos ^{2}x-1\),\(x∈R\).
              \((I)\)求函数\(f(x)\)的最小正周期和单调递减区间;
              \((II)\)在\(\triangle ABC\)中,\(A\),\(B\),\(C\)的对边分别为\(a\),\(b\),\(c\),已知\(c= \sqrt {3}\),\(f(C)=1\),\(\sin B=2\sin A\),求\(a\),\(b\)的值.
            • 6.
              已知\(f(x)=\sin (x- \dfrac {π}{3})-1\),则\(f(x)\)的最小正周期是\((\)  \()\)
              A.\(2π\)
              B.\(π\)
              C.\(3π\)
              D.\(4π\)
            • 7.
              已知函数\(f(x)=2\sin x\cos x+\cos 2x\).
              \((\)Ⅰ\()\)求\(f(x)\)的最小正周期及单调递增区间;
              \((\)Ⅱ\()\)求\(f(x)\)在区间\([0, \dfrac {π}{2}]\)上的最大值和最小值.
            • 8.
              函数\(f(x)=2\sin (ωx+φ)(0 < ω < 12,|φ| < \dfrac {π}{2})\),若\(f(0)=- \sqrt {3}\),且函数\(f(x)\)的图象关于直线\(x=- \dfrac {π}{12}\)对称,则以下结论正确的是\((\)  \()\)
              A.函数\(f(x)\)的最小正周期为\( \dfrac {π}{3}\)
              B.函数\(f(x)\)的图象关于点\(( \dfrac {7π}{9},0)\)对称
              C.函数\(f(x)\)在区间\(( \dfrac {π}{4}, \dfrac {11π}{24})\)上是增函数
              D.由\(y=2\cos 2x\)的图象向右平移\( \dfrac {5π}{12}\)个单位长度可以得到函数\(f(x)\)的图象
            • 9.
              已知函数\(f(x)=2\sin (ωx+φ)(ω > 0)\),若\(f( \dfrac {π}{4})=2,f(π)=0\),在\(( \dfrac {π}{4}, \dfrac {π}{3})\)上具有单调性,那么\(ω\)的取值共有\((\)  \()\)
              A.\(6\)个
              B.\(7\)个
              C.\(8\)个
              D.\(9\)个
            • 10.
              已知函数\(f(x)=\cos ^{2}x- \dfrac {1}{2}\),则下列说法正确的是\((\)  \()\)
              A.\(f(x)\)是周期为\( \dfrac {π}{2}\)的奇函数
              B.\(f(x)\)是周期为\( \dfrac {π}{2}\)的偶函数
              C.\(f(x)\)是周期为\(π\)的奇函数
              D.\(f(x)\)是周期为\(π\)的偶函数
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