10.已知函数f(x)=sin2x-(2$\sqrt{2}+\sqrt{2}a$)sin(x+$\frac{π}{4}$)-$\frac{2\sqrt{2}}{cos(x-\frac{π}{4})}$,若对任意x∈[0,$\frac{π}{2}$],不等式f(x)>-3-2a恒成立,则实数a的取值范围是( )
A. | a>2$\sqrt{2}$ | B. | a$<2\sqrt{2}$ | C. | a<3 | D. | a>3 |
6.已知函数f(x)=$\left\{\begin{array}{l}{\sqrt{1-(x-1)^{2}},(0≤x<2)}\\{f(x-2),(x≥2)}\end{array}\right.$,若函数F(x)=f(x)-kx(k>0),有且仅有四个零点,则实数k的取值范围为( )
0 249843 249851 249857 249861 249867 249869 249873 249879 249881 249887 249893 249897 249899 249903 249909 249911 249917 249921 249923 249927 249929 249933 249935 249937 249938 249939 249941 249942 249943 249945 249947 249951 249953 249957 249959 249963 249969 249971 249977 249981 249983 249987 249993 249999 250001 250007 250011 250013 250019 250023 250029 250037 266669
A. | ($\frac{\sqrt{2}}{2},\frac{\sqrt{3}}{2}$) | B. | ($\frac{\sqrt{2}}{4},\frac{\sqrt{2}}{2}$) | C. | ($\frac{\sqrt{6}}{12},\frac{\sqrt{2}}{4}$) | D. | ($\frac{\sqrt{3}}{13},\frac{\sqrt{6}}{12}$) |