It is denoted by i, and is called the imaginary square root of -1.
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square root of -1
Yes, but it involves the square root of -1. sqrt (-X) = sqrt (X) * sqrt(-1)
value for root 3 is 1.732
sin75 = sin(45 + 30) = sin45cos30 + cos45sin30 = (1/root 2)((root 3)/2) + (1/root 2)(1/2)
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