one squared equals one.
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12 squared (12 x 12) = 144
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)