Attempt following question by selecting a choice to answer.
f
Evaluate
cos 112.5°.
cccc ffffA.
f-
2 +22 B.
f-
24 C.
f-
2 -22D.
f 2 -22
ff
C
Step 1: cos 112.5° = - 1 + cos225o2[Using cos(x2) = - 1 + cosx2.]
Step 2: [Using cos 225° = - 22.]= - 1 + (-22)2
Step 3: = - 2 -22