(sin(a)+cos(a))^2-1/ctg(a)-sin(a)×cos(a) =sin^2a+2sinacosa+cos^2a-tga-sinacosa=(sin^2a+cos^2a)+(2sinacosa-sinacosa)-tga=1+sinacosa-tga
(sin(a)+cos(a))^2-1/ctg(a)-sin(a)×cos(a) =sin^2a+2sinacosa+cos^2a-tga-sinacosa=(sin^2a+cos^2a)+(2sinacosa-sinacosa)-tga=1+sinacosa-tga