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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]