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Samsung Electronics Co is to unveil on Sunday its first wearable smartwatch powered by its Tizen platform in its latest attempt to distance itself from Google Inc and enhance its software and services. Samsung has been jointly developing its mobile platform with Intel Corp, as the dominance of Googles free Android software, which Samsung uses for its Galaxy line of products, continues to grow and is now used in almost 80 percent of the global smartphone market. The launch also underscores Samsungs desire to come up with new products to revive slowing momentum in its mobile business, the tech giants biggest earnings driver, as sales of high-end smartphones have eased in many advanced markets. For the new Galaxy Gear 2 and Neo 2, to be unveiled at an annual trade fair in Barcelona on Sunday, Samsung has not significantly upgraded the hardware on offer.