Срочно помогите упростить выражения
1 ) (1-cos2a+sin2a)/(cosa+sina)
2) (cos^2a)/ (2sin^2 a-1) + (sin^2a) / ( 2cos^2 a-1)
3) ((1-cos4a) cos^2 2a)/(1-cos^2 2a) + ((1+ cos4a) * sin^2 2a)/ (1-sin^2 2a)
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