Let f(x, y) = sin (2x - y) cos y + cos (...

Let `f(x, y) = sin (2x - y) cos y + cos (2x - y) sin y` for all `x,y in R.` The value of `Lim_(x->0) (1 + tan x - x )^(1/(x^2 f(x,y)))` is equal to

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