Q. 2 A4.2( 5 Votes )
Evaluate each of
As cos(–θ) is cos(θ )
∴ (cos) = (cos)
∴ The question becomes cos–1()
Let cos–1 =y
⇒ cos y =
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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