Solve Cos' (Cos 3pie /6)
Answers
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2
Answer:
cos[cos
−1
(
2
−
3
)+
6
π
]
=cos[cos
−1
(cos
6
5π
)][∵cos
6
5π
=
2
−
3
]
=cos(
6
5π
+
6
π
){cos
−1
cosx=x,x∈[0,π]}
=cos(
6
6π
)
=cos(π)=−1
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