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Attempt following question by selecting a choice to answer.
D
Evaluate
sin 67.5°
.
B D
A.
D
2
2
B.
D
2
4
C.
D
2
-
2
2
D.
D
2
+
2
2
D
D
View Solution Steps
Step 1: sin 67.5° = +
1
-
cos
1
3
5
o
2
[sin 67.5° is positive; 67.5° =
1
2
× 135°.]
[Use sin(
x
2
) = +
1
-
cos
x
2
.]
Step 2: sin 67.5° =
1
-
(
-
2
2
)
2
[Using cos 135° = -
2
2
.]
Step 3: =
2
+
2
2
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