Q.

Range of function f(x)=log2⁡π+2sin−1⁡3−x7π is

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a

(−∞,1)

b

(1,∞)

c

(−∞,1]

d

[1,∞)

answer is C.

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Detailed Solution

-π2≤sin-13-x7≤π2⇒ -π ≤ 2 sin-13-x7≤π⇒0≤π+2sin-13-x7≤2π⇒0≤π+2 sin-13-x7π≤2⇒-∞< logπ+2 sin-13-x7π 2 ≤1      since logarithem function is defined for only positive values   hence range is =(-∞,1]
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