(sin^2((3П/2)-а))/(ctg(a-2П))+(sin^2(-a))/(ctg^2(a-(3П/2)))=cos^2a/ctga+sin^2a/tg^2a=sina*cosa+sina*cosa=2sina*cosa
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(sin^2((3П/2)-а))/(ctg(a-2П))+(sin^2(-a))/(ctg^2(a-(3П/2)))=cos^2a/ctga+sin^2a/tg^2a=sina*cosa+sina*cosa=2sina*cosa