优优班--学霸训练营 > 知识点挑题
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            • 1.
              已知\(f(x)=2 \sqrt {3}\sin x\cos x+2\cos ^{2}x-1\).
              \((I)\)求\(f( \dfrac {π}{6})\)的值;
              \((\)Ⅱ\()\)求\(f(x)\)的单调递增区间.
            • 2.
              已知\(\sin α= \dfrac { \sqrt {5}}{5}\),则\(\sin ^{4}α-\cos ^{4}α\)的值为 ______ .
            • 3.
              已知函数\(f(x)= \dfrac { \sqrt {3}}{2}\sin 2x+ \dfrac {1}{2}\cos 2x\),若其图象是由\(y=\sin 2x\)图象向左平移\(φ(φ > 0)\)个单位得到,则\(φ\)的最小值为\((\)  \()\)
              A.\( \dfrac {π}{6}\)
              B.\( \dfrac {5π}{6}\)
              C.\( \dfrac {π}{12}\)
              D.\( \dfrac {5π}{12}\)
            • 4.
              在平面直角坐标系\(xOy\)中,已知向量\( \overrightarrow{m}=( \dfrac { \sqrt {2}}{2},- \dfrac { \sqrt {2}}{2})\),\( \overrightarrow{n}=(\sin x,\cos x)\),\(x∈(0, \dfrac {π}{2})\).
              \((1)\)若\( \overrightarrow{m}⊥ \overrightarrow{n}\),求\(\tan x\)的值;
              \((2)\)若\( \overrightarrow{m}\)与\( \overrightarrow{n}\)的夹角为\( \dfrac {π}{3}\),求\(x\)的值.
            • 5.
              已知函数\(f(x)=A\sin (ωx+φ),(A > 0,ω > 0,0 < φ < \dfrac {π}{2}),x∈R,f(x)\)的最小值为\(-4\),\(f(0)=2 \sqrt {2}\),且相邻两条对称轴之间的距离为\(π\).
              \((I)\)当\(x∈[- \dfrac {π}{2}, \dfrac {π}{2}]\)时,求函数\(f(x)\)的最大值和最小值;
              \((II)\)若\(x∈( \dfrac {π}{2},π)\),且\(f(x)=1,{求}\cos (x+ \dfrac {5π}{12})\)的值.
            • 6.
              已知向量\( \overrightarrow{a}=(m,\cos 2x)\),\( \overrightarrow{b}=(\sin 2x,1)\),函数\(f(x)= \overrightarrow{a}⋅ \overrightarrow{b}\),且\(y=f(x)\)的图象过点\(( \dfrac {π}{12}, \sqrt {3}).\)
              \((1)\)求\(m\)的值;
              \((2)\)将\(y=f(x)\)的图象向左平移\(φ(0 < φ < π)\)个单位后得到函数\(y=g(x)\)的图象,若\(y=g(x)\)图象上各最高点到点\((0,3)\)的距离的最小值为\(1\),求\(y=g(x)\)的单调递增区间.
            • 7.
              若\(\tan \dfrac {π}{12}\cos \dfrac {5π}{12}=\sin \dfrac {5π}{12}-m\sin \dfrac {π}{12}\),则实数\(m\)的值为\((\)  \()\)
              A.\(2 \sqrt {3}\)
              B.\( \sqrt {3}\)
              C.\(2\)
              D.\(3\)
            • 8.
              已知\(A(1,4 \sqrt {3})\),将\( \overrightarrow{OA}\)绕坐标原点\(O\)逆时针旋转\( \dfrac {π}{3}\)至\( \overrightarrow{OB}\),则点\(B\)的纵坐标为\((\)  \()\)
              A.\( \dfrac {3 \sqrt {3}}{2}\)
              B.\( \dfrac {5 \sqrt {3}}{2}\)
              C.\( \dfrac {11}{2}\)
              D.\( \dfrac {13}{2}\)
            • 9.
              已知函数\(f(x)=\sin ωx+ \sqrt {3}\cos ωx\)的最小正周期为\(π\),\(x∈R\),\(ω > 0\)是常数.
              \((1)\)求\(ω\)的值;
              \((2)\)若\(f( \dfrac {θ}{2}+ \dfrac {π}{12})= \dfrac {6}{5}\),\(θ∈(0, \dfrac {π}{2})\),求\(\sin 2θ\).
            • 10.
              已知向量\( \overrightarrow{a}=(\cos x,\sin x)\),\( \overrightarrow{b}=(3,- \sqrt {3})\),\(x∈[0,π]\)
              \((1)\)若\( \overrightarrow{a}/\!/ \overrightarrow{b}\),求\(x\)的值;\((2)\)记\(f(x)= \overrightarrow{a}\cdot \overrightarrow{b}\),求\(f(x)\)的最大值和最小值以及对应的\(x\)的值.
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