1/sin^2a=1+ctg^2a
поэтому 1/sin^2a -ctg^2a-cos^2b=1+ctg^2a -ctg^2a-cos^2b=1-cos^2b=sin^2b
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1/sin^2a=1+ctg^2a
поэтому 1/sin^2a -ctg^2a-cos^2b=1+ctg^2a -ctg^2a-cos^2b=1-cos^2b=sin^2b