योग्य नित्य समानता दर्शविणारा पर्याय कोणता ?
1
\(\frac{1}{x^2} + 2x + x^2 = \left(x + \frac{1}{x}\right)^2\)
2
\(\frac{1}{3x^2} - 2 + (3x^2) = \left(\frac{1}{3x}-3x\right)^2\)
3
\(\frac{1}{x^2} - x^2 = \left(\frac{1}{x}-x\right) \left(x + \frac{1}{x}\right)\)
4
\(\left(\frac{1}{x}+x\right)^2 = \left(\frac{1}{x}- x\right)^2 - 4\)