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55
Mark for Review
Which of the following expressions is equivalent to
(
cos
2
3
∘
)
(
sin
6
7
∘
)
+
(
sin
2
3
∘
)
(
cos
6
7
∘
)
?
A
2
(
cos
2
3
∘
)
(
sin
6
7
∘
)
Check
B
2
(
cos
2
3
∘
)
+
2
(
cos
6
7
∘
)
Check
C
(
cos
2
3
∘
)
2
+
(
sin
6
7
∘
)
2
Check
D
(
cos
2
3
∘
)
2
+
(
cos
6
7
∘
)
2
Check