var('t')
T = 1
B = sinh(t)^2/sinh(T)^2 - sinh(2*t)^2/sinh(2*T)^2
plot(B, (t, 0, T))
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var('t')
T = 1
B = sin(t)^2/sin(T)^2 - sin(2*t)^2/sin(2*T)^2
plot(B, (t, 0, T))
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