Since x represents a single number, and it is x squared over x squared, then it will be the same numbers in the numerator and the denominator, no matter what value you replace x with (as long as you replace both x's with the same number). Therefore the answer is 1, unless the value of x is 0, in which case it is undefined.
eg: 5 squared / 5 squared = 1 100 squared / 100 squared = 1 Try it with your calculator.
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(X2) (X2) = X4 x squared multiplied by x squared is x raised to the 4th power.
Sin squared, cos squared...you removed the x in the equation.
If you mean a2 x a2... the answer is a4
X = √63
2 x cosine squared x -1 which also equals cos (2x)