Question

is it possible for someone to check my answers?
1. determine the period of y=tan(b/2 x)
2. determine the period of y=sec x
3. what is the value of x for which sec x=1 for the following interval? [0, pi]
4. determine the value of y for the following equation y=sec(pi)
5. if cos x=1, what is the value of sec x?
6. determine the range of y=tan 2x
7. determine the period of y=tan 2x
my answers :
1. 2pi/b
2. 2pi
3. 0
4. -1
5. 1
6. (-infinity, infinity)
7. pi/2