优优班--学霸训练营 > 知识点挑题
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            • 1.
              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.
            • 2.
              已知函数\(f(x)=(\sin x+\cos x)^{2}-\cos 2x\).
              \((\)Ⅰ\()\)求\(f(x)\)的最小正周期;
              \((\)Ⅱ\()\)求证:当\(x∈[0, \dfrac {π}{2}]\)时,\(f(x)\geqslant 0\).
            • 3.
              已知函数\(f(x)= \sqrt {3}\sin x\cos x-\cos ^{2}x- \dfrac {1}{2}\).
              \((\)Ⅰ\()\)求函数\(f(x)\)的对称中心;
              \((\)Ⅱ\()\)求\(f(x)\)在\([0,π]\)上的单调区间.
            • 4.
              已知函数\(f(x)=\cos ^{2}x+ \sqrt {3}\sin (π-x)\cos (π+x)- \dfrac {1}{2}\)
              \((\)Ⅰ\()\)求函数\(f(x)\)在\([0,π]\)的单调递减区间;
              \((\)Ⅱ\()\)在锐角\(\triangle ABC\)中,内角\(A\),\(B\),\(C\),的对边分别为\(a\),\(b\),\(c\),已知\(f(A)=-1\),\(a=2\),\(b\sin C=a\sin A\),求\(\triangle ABC\)的面积.
            • 5.
              已知角\(A\),\(B\),\(C\)为等腰\(\triangle ABC\)的内角,设向量\( \overrightarrow{m}=(2\sin A-\sin C,\sin B)\),\( \overrightarrow{n}=(\cos C,\cos B)\),且\( \overrightarrow{m}/\!/ \overrightarrow{n}\),\(BC= \sqrt {7}\)
              \((\)Ⅰ\()\)求角\(B\);
              \((\)Ⅱ\()\)在\(\triangle ABC\)的外接圆的劣弧\( \overparen {AC}\)上取一点\(D\),使得\(AD=1\),求\(\sin ∠DAC\)及四边形\(ABCD\)的面积.
            • 6.
              设向量\( \overrightarrow{a}=(\sin x, \sqrt {3}\cos x), \overrightarrow{b}=(-1,1), \overrightarrow{c}=(1,1).(\)其中\(x∈[0,π])\)
              \((1)\)若\(( \overrightarrow{a}+ \overrightarrow{b})/\!/ \overrightarrow{c}\),求实数\(x\)的值;
              \((2)\)若\( \overrightarrow{a}\cdot \overrightarrow{b}= \dfrac {1}{2}\),求函数\(\sin (x+ \dfrac {π}{6})\)的值.
            • 7.
              已知函数\(f(x)=\sin 3x\cos x-\cos 3x\sin x+\cos 2x\).
              \((\)Ⅰ\()\) 求\(f( \dfrac {π}{4})\)的值;
              \((\)Ⅱ\()\) 求\(f(x)\)的单调递增区间.
            • 8.
              求证:\( \dfrac {1+2\sin α\cdot \cos α}{\sin ^{2}\alpha -\cos ^{2}\alpha }= \dfrac {\tan α+1}{\tan \alpha -1}\).
            • 9.
              设\(f(x)=\cos ^{2}x+a\sin x- \dfrac {a}{4}- \dfrac {1}{2}(0\leqslant x\leqslant \dfrac {π}{2})\),其中\(a > 0\).
              \((1)\)用\(a\)表示\(f(x)\)的最大值\(M(a)\);
              \((2)\)当\(M(a)=2\)时,求\(a\)的值.
            • 10.
              已知向量\( \overrightarrow{a}=(\cos \dfrac {3x}{2},\sin \dfrac {3x}{2})\),\( \overrightarrow{b}=(\cos \dfrac {x}{2},-\sin \dfrac {x}{2})\),函数\(f(x)= \overrightarrow{a}⋅ \overrightarrow{b}-m| \overrightarrow{a}+ \overrightarrow{b}|+1\),\(x∈[- \dfrac {π}{3}, \dfrac {π}{4}]\),\(m∈R\).
              \((1)\)当\(m=0\)时,求\(f( \dfrac {π}{6})\)的值;
              \((2)\)若\(f(x)\)的最小值为\(-1\),求实数\(m\)的值;
              \((3)\)是否存在实数\(m\),使函数\(g(x)=f(x)+ \dfrac {24}{49}m^{2}\),\(x∈[- \dfrac {π}{3}, \dfrac {π}{4}]\)有四个不同的零点?若存在,求出\(m\)的取值范围;若不存在,说明理由.
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