помогите. cos^2a+tg^2a+sin^2a=tg^2a+1
cos^2a+tg^2a+sin^2a=tg^2a+1
tg^2a+(cos^2a+sin^2a) = tg^2a+ 1
tg^2a+ 1= tg^2a+ 1
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cos^2a+tg^2a+sin^2a=tg^2a+1
tg^2a+(cos^2a+sin^2a) = tg^2a+ 1
tg^2a+ 1= tg^2a+ 1