共50条信息
若角\(a\)的终边落在直线\(x+y=0\)上,则\(\dfrac{\sin a}{ \sqrt{1-{\sin }^{2}a}}+ \dfrac{ \sqrt{1-{\cos }^{2}a}}{\cos a} \)________________
在锐角\(\Delta ABC\)中,\(A,B,C\)的对边分别为\(a,b,c\),\( \dfrac{b}{a}+ \dfrac{a}{b}=6\cos C \),则\( \dfrac{\tan C}{\tan A}+ \dfrac{\tan C}{\tan B} =\)________\(\_\)。
计算\( \dfrac{\cos 10^{\circ}- \sqrt{3}\cos (-100^{\circ})}{ \sqrt{1-\sin 10^{\circ}}}=\)________\((\)用数字作答\()\).
已知\(\sin \left( \dfrac{π}{4}-x\right)= \dfrac{3}{5} \),则\(\sin 2x \)的值为________
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