Ответы на вопрос:
(15-5y)/(9-yˇ2)=5(3-y)/(3+y)(3-y)=5/(3+y) (mˇ2-4mn+4nˇ2)/(mˇ2-4nˇ2)=(m-2n)(m-2n)/(m+2n)(m-2n)= =(m-2n)/(m+2n)
sin(x/3 + п/4)=-1
x/3 + п/4 = -п/2 +2пk
x/3 = -п/2 - п/4 +2пk
x/3 =-3п/4 +2пk
x =-9п/4 +6пk
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