If \( T_{0}, T_{1}, T_{2}, \ldots \ldots T_{n} \) represent the terms in the expansion of \( (x+....
If \( T_{0}, T_{1}, T_{2}, \ldots \ldots T_{n} \) represent the terms in the expansion of \( (x+a)^{n} \), then \( \left(T_{0}-T_{2}+T_{4}-\ldots\right)^{2}+\left(T_{1}\right. \) \( \left.-T_{3}+T_{5}-\ldots ..\right)^{2}= \)
\( \mathrm{P} \)
(1) \( \left(x^{2}+a^{2}\right) \)
(2) \( \left(x^{2}+a^{2}\right)^{n} \)
(3) \( \left(x^{2}+a^{2}\right)^{1 / n} \)
(4) \( \left(x^{2}+a^{2}\right)^{-1 / n} \)
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