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Let y=ln(1+cosx)^2 then the value of (d^...

Let `y=ln(1+cosx)^2` then the value of `(d^2y)/(dx^2)+2/(e^(y//2))` equals 0 (b) `2/(1+cosx)` (c) `4/((1+cosx))` (d) `(-4)/((1+cosx)^2)`

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