find the value of cos inverse cos 7pie by 6
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Answer:
You can write
7
π
6
as
(
π
+
π
6
)
Thus we can clearly see the angle falls in the third quadrant. And the cosine value in third quadrant is always negative.
Hence,
cos
(
π
+
π
6
)
=
−
cos
(
π
6
)
coming back to the question
cos
−
1
[
cos
(
7
π
6
)
]
=
cos
−
1
[
−
cos
(
π
6
)
]
=
π
−
cos
−
1
[
cos
(
π
6
)
]
=
π
−
π
6
=
5
π
6
Step-by-step explanation:
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