ПОМГИТЕ РЕШИТЬ, СРОЧНО!!!!(ДАЮ МНОГО БАЛЛОВ)
1)[tex]\frac{cos2a}{1+sin2a}-\frac{1-tga}{1+tga\\}[/tex]
2) 2cos(45°+a)*cos(45°-a)
3)[tex]\frac{1+tg^{4}a }{tg^{2}a+ctg^{2}a}[/tex]
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