12. Which of these is a possible solution for secx - 2 = 0 in the interval x = [0, 2x]?

21

4x

d.

b.

x=3

3

a.

X=

a.

3x

13. Determine the average rate of change of the function y = cos x from x =

4

√₂

x =

C.

b.

x=

X=

2x

a. 2

√₂

П

14. Which of these is a possible solution for cos²x+ sin²x-1=0 in the interval x = [0, 2x]?

5T

b.

X = X

d.

3

C.

ST

3

C.

to X-

15. How many solutions exist for sinx cos x = 0 in the interval x = [0,21]?

b.

a.

2

3

C.

4

d.

X=

d.

7x

I

all of the above

5