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Q.

cossinx=12then xmust lie in the interval :

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a

π4,π2

b

−π4,0

c

π,3π2

d

π2,π

answer is A.

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Detailed Solution

cossinx=12=cosπ4⇒sinx=2nπ±π4, n∈Ι⇒sinx=±π4       ∵-1≤sinx≤1∴x∈π4,π2, π2,π and π,3π2
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