Question 597531
Sin^2 x= cos^2 x for 0 degrees less than or equal to x which is less than 360 degrees
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Sin^2 x= cos^2 x  0 <= x < 360
Sub (1 - sin^2) for cos^2
sin^2 = 1 - sin^2
2sin^2 = 1
sin^2 = 1/2
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sin = -sqrt(2)/2, +sqrt(2)/2
x = 45 degs, 135 degs, 225 degs, 315 degs