Q. 2 B5.0( 4 Votes )
Evaluate each of
Answer :
The value of cos is
Now,
∴ The question becomes cos–1()
Let cos–1 = y
⇒ cos y =
= –cos
= cos
⇒ cos
The range of principal value of cos–1 is [0,π] and cos
Therefore, the value of cos–1(cos) is
.
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