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When \(a \ne 0\), there are two solutions \(ax^2 + bx + c = 0\)

π=a·2n+122+2+2+nthterm+a12  \pi =a\cdot \left( 2^{n+1}\right) \left\{ 2-\sqrt {2+\sqrt {2+\sqrt {2+\ldots n^{th term}+\sqrt {a}}}}\right\} ^{\dfrac {1}{2}} 

\( \lim_{x \rightarrow 0} \frac{Sin x}{x} = 1\) [where x is measured in radian]