(sin(3П/2+a)+sin(2П+a)/(2cos(-a)sin(-a)+1)=
=-cos a + sin a / (2 cos a * (-sin a) +1) =
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(sin(3П/2+a)+sin(2П+a)/(2cos(-a)sin(-a)+1)=
=-cos a + sin a / (2 cos a * (-sin a) +1) =