This question is somewhat ambiguous because of the terminology used.
If 52000 m squared refers to a square with sides of 52000 m then the shape is equivalent to 52 km * 52 km which is 2704 km2.
On the other hand, 52000 m2 is 0.052 km2
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one squared equals one.
1 squared radical 40 is equal to 1 squared radical (4 x 10), and this become 2 squared radical 10. By adding 2 squared radical10 with 3 squared radical 10 we get 5 squared radical 10.
i = sqrt of (-1) ( imaginary) i squared = sqrt(-1) x sqrt (-1) = -1 (minus one)
This expression factors as x -1 quantity squared.
2 x cosine squared x -1 which also equals cos (2x)