If f(x)={x}times{(-x)/(2)}sin pi x and n...

If `f(x)={x}times{(-x)/(2)}sin pi x` and `n` is number of non differentiable points of `f(x)` in the interval `x in[0,50]` , then area defined by `|5y|+|5x|le n` is (where `{}` denotes fractional)

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