sin[α+(k+1)л]+sin[α-(k+1)л]/sin(α+kл)*cos(α-kл)
k偶数
=[sin[α+л]+sin[α-л] ]/sinα*cosα
=2sin(α+л)/(sinacosa)=2sin(-a)/(sinacosa)=-2/cosa
k奇数
=[sinα+sinα]/sin(α+л)*cos(α-л)
=2sina/[sin(-a)*cos(л-α)]
=2/cosa
sin[α+(k+1)л]+sin[α-(k+1)л]/sin(α+kл)*cos(α-kл)=
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