1. (1+ctg^2a)*sin^2a+12. (tga*ctga-cos^2a)*1/sin^2a3. tga*ctga+sina

Question

alexander02 · Accepted Answer

1. (1+ctg^2a)*sin^2a+1=1/sin^2a*sin^2a+1=1+1=22. (tga*ctga-cos^2a)*1/sin^2a=(1-cos^2a)*1/sin^2a=sin^2a*1/sin^2a=13.tga*ctga+sina=1+sina

1. (1+ctg^2a)sin^2a+12. (tgactga-cos^2a)1/sin^2a3. tgactga+sina