请教sin(a+b)-sina=2cos(a+b/2)sinb/2sin(a+b)-sina=2cos(a+b/2)sinb/2如何化解的?这是在求导数b趋近于0时碰到的,但是好像是直接化解的,还没用到极限去化解
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![请教sin(a+b)-sina=2cos(a+b/2)sinb/2sin(a+b)-sina=2cos(a+b/2)sinb/2如何化解的?这是在求导数b趋近于0时碰到的,但是好像是直接化解的,还没用到极限去化解](/uploads/image/z/5408131-67-1.jpg?t=%E8%AF%B7%E6%95%99sin%28a%2Bb%29-sina%3D2cos%28a%2Bb%2F2%29sinb%2F2sin%28a%2Bb%29-sina%3D2cos%28a%2Bb%2F2%29sinb%2F2%E5%A6%82%E4%BD%95%E5%8C%96%E8%A7%A3%E7%9A%84%3F%E8%BF%99%E6%98%AF%E5%9C%A8%E6%B1%82%E5%AF%BC%E6%95%B0b%E8%B6%8B%E8%BF%91%E4%BA%8E0%E6%97%B6%E7%A2%B0%E5%88%B0%E7%9A%84%2C%E4%BD%86%E6%98%AF%E5%A5%BD%E5%83%8F%E6%98%AF%E7%9B%B4%E6%8E%A5%E5%8C%96%E8%A7%A3%E7%9A%84%2C%E8%BF%98%E6%B2%A1%E7%94%A8%E5%88%B0%E6%9E%81%E9%99%90%E5%8E%BB%E5%8C%96%E8%A7%A3)
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