Упростите выражение:
1)1-sin^2a=
2)1+sin^2a+cos^2a=
3)(1-cosa)(1+cosa)=
4)sina-sina*cos^2a=sina*( )=
5)sin^4a+2sin^2a*cos^2a+cos^4a=
6)tg^2a-sin^2a*tg^2a=
7)cos^2a+cos^2a*tg^2a=
8)tg&2a*(2cos^2a+sin^2a-1)=
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