Ответ:
(1+cos2b)tg(2П-b)=-tgb*(2cos²b)=-2sinbcosb=-sin2b
(sina/(1+cosa)+sina/(1-cosa))1/(1+ctg²a)=2sina/(1-cos²a)*sin²a=
=2sina*sin²a/sin²a=2sina
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Ответ:
(1+cos2b)tg(2П-b)=-tgb*(2cos²b)=-2sinbcosb=-sin2b
(sina/(1+cosa)+sina/(1-cosa))1/(1+ctg²a)=2sina/(1-cos²a)*sin²a=
=2sina*sin²a/sin²a=2sina