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Senior high school mathematics is a compulsory exercise.
First, multiple choice questions

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