lim[1÷(sinx)^2 - (cosx)^2÷x^2],求当x→0是的极限,
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![lim[1÷(sinx)^2 - (cosx)^2÷x^2],求当x→0是的极限,](/uploads/image/z/6937246-46-6.jpg?t=lim%5B1%C3%B7%28sinx%29%5E2+-+%28cosx%29%5E2%C3%B7x%5E2%5D%2C%E6%B1%82%E5%BD%93x%E2%86%920%E6%98%AF%E7%9A%84%E6%9E%81%E9%99%90%2C)
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