1)(1-sin2a)/(1-cos2a)+tga * ctg a

ответ : 1/sin2a
2)sin2 b+tg2 b -(1/cos2 b )

otvet: синус а * косинус а

3) sin a /(1-cos a)+sin a /1+cos a
ответ: - косинус2 б



плиз помогите прошууууу 
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