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If `y=cos^(-1)(2x)+2cos^(-1)sqrt(1-4x^2),-1/2<x<0` , find `(dy)/(dx)`

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If `y=cos^(-1)(2x)+2cos^(-1)sqrt(1-4x^2),-1/2<x<0` , find `(dy)/(dx)`
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`y=cos^(-1)(2x)+2cos^(-1)sqrt(1-4x^2)`
`dy/dx=-1/(sqrt(1-4x^2)) xx 2 -1/(x)xx1/(2(sqrt(1-4x^2)))xx-8x`
`dy/dx=-6/(sqrt(1-4x^2))`
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