## Question

###### If $f(x)=an x$, then$f^{n}(0)-{ }^{n} C_{2} f^{n-2}(0)+{ }^{n} C_{4} f^{n-4}(0)-ldots=$(A) $sin frac{n pi}{2}$(B) $cos frac{n pi}{2}$(C) $an frac{n pi}{2}$(D) None of these

If $f(x)= an x$, then $f^{n}(0)-{ }^{n} C_{2} f^{n-2}(0)+{ }^{n} C_{4} f^{n-4}(0)-ldots=$ (A) $sin frac{n pi}{2}$ (B) $cos frac{n pi}{2}$ (C) $ an frac{n pi}{2}$ (D) None of these

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