Задание:
sin^2t cos^2t (tg^2 t+ctg^2 t+2) Упростите выражение.
Решение:
sin^2 (t)*cos^2 (t)*[ (sin^2 (t) /cos^2 (t)+(cos^2 (t) /sin^2 (t)+2) ]=sin^2 (t)*cos^2 (t)*[ (sin^4 (t)+cos^4 (t)+2cos^2 (t)*sin^2 (t) /sin^2 (t)*cos^2 (t) ]=(cos^2 (t)+sin^2 (t) ^2=1
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