Which of the following functions is bounded

The range log10⁡x is (−∞,∞) so y=1−log10⁡xis unbounded y=e−2x is unbounded from below as x→−∞ y→∞. The range of sin−1⁡x is −π2,π2 so y=sin−1⁡(2x+1) isa bounded function. The range of tan x is R so y = tan (4x + 1) is unbounded