80
80
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6400 = (6 x 1000) + (4 x 100) + (0 x 10) + (0 x 1)
The value of 'x' is 50.
8
0.5*8=.40
sin(theta) reach a maximum at pi / 2 + all even multiple of 2 pi. As a result, the smallest positive value of x where y = sin(2x) is maximal is pi / 2.