84.ifx=7+4root3 then the value of rootx+1rootx

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f (x) = ⎧ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎨ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ \begin{matrix} \frac{1 - cos 4 x}{x^{2}}, & i f & x < 0 a, & i f & x = 0 \frac{\sqrt{x}}{\sqrt{16 + \sqrt{4}} - 4}, & i f & x > 0 \end{matrix}

a, f

x = 0

\frac{1 + s i n}{1 - s i n}

f : R \to R

f (x) = {\begin{matrix} k - 2 x, i f x \leq - 1 2 x + 3, i f x > - 1 \end{matrix}

k

⎧ ⎨ ⎩ \begin{matrix} x, if x \leq 1 c x + k, if 1 < x < 4 - 2 x, if x \geq 4 \end{matrix}

c

k

If x = \frac{\sqrt{5} - 2}{\sqrt{5} + 2}

x + \frac{1}{x}

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