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dy/dx=(dy/dt)/(dx/dt)=(cost-cost+tsint)/(cost-sint)=tsint/(cost-sint)=t/(ctgt-1)
1)
5x=15+10
5x=25
x=5
2)
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3)
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3x²-4x=0
x(3x-4)=0
a)x=0
b)3x-4=0,3x=4,x=4/3
x1=0,x2=4/3
Log3(2x-1)=-2log3×1/4
log3(2x-1)=log3((1/4)^-2
2x-1=(1/4)^-2
2x-1=4^2
2x-1=16
2x=16+1
2x=17
x=17/2;x>1/2