cos^2 pie/12 +cos^2 3pie/12 + cos^2 5pie/12
Answers
Answered by
0
Step-by-step explanation:
Solution
Correct option is
C
3/2
Solution:
cos
2
12
π
+cos
2
4
π
+cos
2
12
5π
=cos
2
12
π
+cos
2
4
π
+cos
2
(
2
π
−
12
π
)
=cos
2
12
π
+cos
2
4
π
+sin
2
12
π
=cos
2
12
π
+sin
2
12
π
+cos
2
4
π
=1+(
2
1
)
2
=1+
2
1
=
2
3
Hence, C is the correct option.
Similar questions