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[" If the tangent at each point of the e...

[" If the tangent at each point of the eurve "],[y=(2)/(3)x^(3)-2ax^(2)+2x+5" males an acute angle with the "],[" positive direction of xexin,then "],[[" (a) "a>=1,(b)-1<=a<=1],[" (c) "a<=-1," (d) woe or these "]]

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