61x^2 + 1 = y^2.
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Yes, if x and y = 1 √1 + √1 = √1 + 1 1 + 1 = 1 + 1 QED
Square root of 3=1 so 1+4=5
1 plus 1 plus 1 plus 1 equals 1 times 4. 1 times 4 equals 4. 4 minus 4 equals 0. 0
No. But sin2a equals 1 minus cos2a ... and ... cos2a equals 1 minus sin2a
x=1/2(-1-square root of 21) and x=1/2(square root of 21 -1)