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[" 23.Solve for "x," if "tan(cos^(4)x)=s...

[" 23.Solve for "x," if "tan(cos^(4)x)=sqrt(5)],[" 24.If "sin^(-1)x+tan^(-1)x=(pi)/(2)," prove that "2x^(2)+1=sqrt(5)],[" ANSWERS AND HINTS "]

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