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24 = 2 x 2 x 2 x 2= 1616
You cannot solve log x- 2 unless (i) log x - 2 is equal to some number or (ii) x is equal to some number.
Cos^2 x = 1 - sin^2 x
The real numbers greater than or equal to -2, represented by {x: x >= -2 }, is a set. A set is simply a group of things, which you can ask if a particular element is in that set. For example, 17.273 is in {x: x >= -2}, but "apple" is not in {x: x >= -2}. In this case, the set {x: x >= -2} contains all the real numbers that are greater than or equal to -2 and nothing else.
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