Ответы на вопрос:
4√2-8√2*(1-cos9π/4)/2=4√2-4√2(1-cos(2π+π/4)=4√2-4√2+4√2*cosπ/4=4√2*1/√2=4 y=5x-ln(x+3)^5 +1 y`=5-5(x+3)^4/(x+3)=5-5(x+3)³=0 5(x+3)³=5 (x+3)³=1 x+3=1 x=-2 y(-2)=-10-ln1+1=-10-0+1=-9
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