On a computer, there should be a letter X with the number 2 in the exponent position. It should look like this: x2
In writing, you just mark it near the top right hand corner of the number or variable.
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It is 8
-2 squared is +4.
-3 squared by 2
You could just pull out the half: it will be (1/2) cos squared x.
2 squared = 2^(2) = 4