Предмет: Алгебра, автор: iavnprix

Упростить.
1)(1/sin^2a)-(ctg^2a)-(cos^2b)
2)(ctg^2a-cos^2a)*((1/1cos^2a)-1)

Ответы

Автор ответа: Alexаndr
0
1)frac{1}{sin^2a}-ctg^2a-cos^2b=1+ctg^2a-ctg^2a-cos^2b=1-cos^2b=sin^2b

2)(ctg^2a-cos^2a)*(frac{1}{cos^2a}-1)=(ctg^2a-cos^2a)*tg^2a=\=1-sin^2a=cos^2a
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