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[" 7) For the equation "cos^(-1)x(1)" f ...

[" 7) For the equation "cos^(-1)x_(1)" f "f^(" lutions is ")|_(1)^(1)2x+(h_(t))/(mu)=0" ,the number of real solutions is "],[[" a) "1," b) "2," () "," ( "0.," d) "oo]]

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