cosL=√(1-〖sin〗^2 )=√(1-441/841)=√(400/841)=20/29 tgL=sinL/cosL=-21/29×29/20=-21/20 ctgL=-20/21
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cosL=√(1-〖sin〗^2 )=√(1-441/841)=√(400/841)=20/29 tgL=sinL/cosL=-21/29×29/20=-21/20 ctgL=-20/21