Please answer correctly. 500 points Part 2: True and False (1 mark each) In each
ID: 2871801 • Letter: P
Question
Please answer correctly. 500 points
Part 2: True and False (1 mark each)
In each of the following, if the expression is a trigonometric identity, indicate the statement as true (T). If is is not a
trigonometric identity, indicate the statement as false (F).
14. sin^2(x) = 1+cos(2x)/2
15. cos^2(x) = 1-cos(2x)/2
16. sin(2x) = 2 sin(x) cos(x)
17. sin^2(x) + cos^2(x) = 1
18. sec^2(x) = 1- tan^2(x)
19. cos(x) = cos(-x)
20. -sin(x) = sin(-x)
21. cos(2x) = cos^2(x)- sin^2(x)
22. cos(2x) = 2 cos^2(x)- 1
23. cos(2x) = 1- 2 sin^2(x)
24. sin(2x) = sin(x) cos(x)
25. cos(x + y) = sin(x) cos(y) ?-cos(x) sin(y)
Explanation / Answer
14) false
15)false
16)true
17)true
18)false
19)true
20)true
21)true
22)true
23)true
24)false
25)false