Очень прошу,помогите!!!!

Упростить выражения
1) 1-1/cos^2a
2) tg^2a*ctg^2a-cos^2a
3) 1+2sin a*cos a/sin a+cos a
4) tg a-ctg a+1
5) sin a+tg a/1+cos^2a
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