优优班--学霸训练营 > 知识点挑题
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            • 1.
              设\(\sin ( \dfrac {π}{4}+θ)= \dfrac {1}{3}\),则\(\sin 2θ=(\)  \()\)
              A.\(- \dfrac {1}{9}\)
              B.\(- \dfrac {7}{9}\)
              C.\( \dfrac {1}{9}\)
              D.\( \dfrac {7}{9}\)
            • 2.
              已知角\(α\)的顶点为坐标原点,始边与\(x\)轴的非负半轴重合,终边上有两点\(A(1,a)\),\(B(2,b)\),且\(\cos 2α= \dfrac {2}{3}\),则\(|a-b|=(\)  \()\)
              A.\( \dfrac {1}{5}\)
              B.\( \dfrac { \sqrt {5}}{5}\)
              C.\( \dfrac {2 \sqrt {5}}{5}\)
              D.\(1\)
            • 3.
              已知 \(α\),\(β\)为锐角,且\(\tan α=7\),\(\sin (α-β)= \dfrac { \sqrt {10}}{10}\),则\(\cos 2β=(\)  \()\)
              A.\( \dfrac {3}{5}\)
              B.\(- \dfrac {3}{5}\)
              C.\( \dfrac {2 \sqrt {5}}{5}\)
              D.\( \dfrac { \sqrt {5}}{5}\)
            • 4.
              \(\sin 15^{\circ}⋅\cos 15^{\circ}=\) ______ .
            • 5.
              函数\(y=2\sin ^{2}(2x)-1\)的最小正周期是 ______ .
            • 6.
              已知\(\cos α=- \dfrac {4}{5}\),\(α\)为第三象限角.
              \((1)\)求\(\sin α\),\(\tan α\)的值; 
              \((2)\)求\(\sin (α+ \dfrac {π}{4})\),\(\tan 2α\)的值.
            • 7.
              已知\(\cos x= \dfrac {3}{4}\),则\(\cos 2x=(\)  \()\)
              A.\(- \dfrac {1}{4}\)
              B.\( \dfrac {1}{4}\)
              C.\(- \dfrac {1}{8}\)
              D.\( \dfrac {1}{8}\)
            • 8.
              已知\(\sin ( \dfrac {π}{4}-x)= \dfrac {3}{5}\),则\(\sin 2x=\) ______ .
            • 9.
              已知函数\(f(x)=\cos ^{2} \dfrac {x}{2}-\sin \dfrac {x}{2}\cos \dfrac {x}{2}- \dfrac {1}{2}\).
              \((1)\)求函数\(f(x)\)的最小正周期和值域
              \((2)\)求函数单调递减区间
              \((3)\)若\(f(α)= \dfrac {3 \sqrt {2}}{10}\),求\(\sin \) \(2α\)的值.
            • 10.
              已知角\(θ\)的顶点与原点重合,始边与\(x\)轴的正半轴重合,终边在直线\(y=- \sqrt {3}x\)上,则\(\sin 2θ=(\)  \()\)
              A.\( \dfrac {1}{2}\)
              B.\( \dfrac { \sqrt {3}}{2}\)
              C.\(- \dfrac {1}{2}\)
              D.\(- \dfrac { \sqrt {3}}{2}\)
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