If y - e - x cos x and y 4- ky -0- where y 4- d 4 y - dx 4- then k -A- 4B- -4C- 2D- -2

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Harmonic Mean

If y = e - x ...

Question

$I f y = e^{- x} c o s x a n d y_{4} + k y = 0, w h e r e y_{4} = \frac{d^{4} y}{d x^{4}}, t h e n k$ =

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