sin(П/2+а)*ctg(П/2-а)/cos(-a)=cos(a)*tan(a)/cos(a)=tan(a)
tg(П+а) *cos(П/2+а)/sin(-a)=tan(a)*(-sin(a))/-sin(a)=tan(a)
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sin(П/2+а)*ctg(П/2-а)/cos(-a)=cos(a)*tan(a)/cos(a)=tan(a)
tg(П+а) *cos(П/2+а)/sin(-a)=tan(a)*(-sin(a))/-sin(a)=tan(a)