Question

Даю 20 балов.Упростите выражение:
1) ( 1− sin2α)(1+ tg2α);
2) tg(-α)*ctg (-α)+ cos2(-α)+sin2α;
3) (sin α+cos α) 2+ (sin α-cos α) 2;
4)(1- cos2α)tg2α+1-tg2α.
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Answer 1

Ответ:

1-sin^2(α) + tg^2(α)

1 + sin^2(α)

2sin^2(α) + 2cos^2(α)

2-2cos^2(α) + tg^2(α)