1, among the following trigonometric function values, the negative value is ();

a . sin(-6600)b . tan(- 1600)c . cos(-7400)d . sin(-4200)cos 570

2. The angle α is the angle of the second quadrant. If │ │ =, the angle belongs to: ()

A. the first quadrant; B. the second quadrant; C. the third quadrant; D. the fourth quadrant

3, known, is the angle of the second quadrant, and then ()

A.； b； c； D. none of the above is correct.

4. The increasing interval of function y= sin(2x+) is ().

A.[- ] B. [- ] C. [- ] D. [- ]

5. known -x