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cos(a-pi/2)/sin(pi-a)+tg(a-pi)*cos(pi+a)*cos(3pi/2+a)
cos(a-pi/2)/sin(pi-a)+tg(a-pi)*cos(pi+a)*cos(3pi/2+a)
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Answers & Comments
1)tg (3pi/2-a)*sin(pi-a)+cos(pi+a)=ctga*sina-cosa=cosa-cosa=0
2)tg (pi/2+a)+ctg(2pi-a)=-ctga-ctga=-2ctga
3) tg(a-pi/2)-cos(2pi-a) / sin(-a)-1=-ctga+cosa/sina-1=-ctga+ctga-1=-1