9.函数y=sin2x+cos2x的值域是( )
A. | [-1,1] | B. | [-2,2] | C. | [-1,$\sqrt{2}$] | D. | [-$\sqrt{2}$,$\sqrt{2}$] |
8.若$tan\frac{α}{2}=2$,则tanα等于( )
A. | $-\frac{4}{3}$ | B. | $\frac{4}{3}$ | C. | -3 | D. | $\frac{3}{4}$ |
7.若角α的终边与单位圆相交于点($\frac{\sqrt{2}}{2}$,-$\frac{\sqrt{2}}{2}$),则sinα的值为( )
A. | $\frac{\sqrt{2}}{2}$ | B. | -$\frac{\sqrt{2}}{2}$ | C. | $\frac{1}{2}$ | D. | -1 |
6.如果sinα=$\frac{5}{13},α∈(\frac{π}{2},π)$,那么cosα等于( )
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A. | $\frac{12}{13}$ | B. | $-\frac{12}{13}$ | C. | $-\frac{13}{12}$ | D. | $\frac{13}{12}$ |