共50条信息
已知:\({\sin }^{2}{30}^{^{\circ}}+{\sin }^{2}90^{\circ}+{\sin }^{2}150^{\circ}= \dfrac{3}{2}{\sin }^{2}5^{\circ}+{\sin }^{2}60^{\circ}+{\sin }^{2}125^{\circ}= \dfrac{3}{2} .\)通过观察上述两等式的规律,写出一般性的命题:_____________________\( = \dfrac{3}{2} \).
\( \dfrac{1}{2\sin 10^{\circ}}-2\sin 70^{\circ}= \) .
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