соs(a-2b)-cos(a+2b)=
(2sin((a-2b)+(a+2b))/2)(sin((a+2b)-(a-2b))/2)=
2sin(2a/2)sin(4b/2)=
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соs(a-2b)-cos(a+2b)=
(2sin((a-2b)+(a+2b))/2)(sin((a+2b)-(a-2b))/2)=
2sin(2a/2)sin(4b/2)=