Calculate: E=sin(a/2-2b), if
a in (0, pi/2)
sin a=4/5
b in (pi/2, pi)
ctg b=-1/2​

Calculate: E=sin(a/2-2b), if
a in (0, pi/2)
sin a=4/5
b in (pi/2, pi)
ctg b=-1/2​

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