2013年4月15日 · tg-1在函数里相当于现在的arctan，就是已知一个角度的正弦值，求这个角的大小

看一本工具书，公式中有tg-1(x)，其中-1是上标。表示tg(x)的倒数吗？还是反三角函数？好像都不对啊，请各位指点。2014/0504/w758h68384_1399170948_909.jpg|bcs|1snap.jpg

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T0.1和T0.5是各厂家标注闪光灯持续时间的标准，也是选购闪光灯非常重要的参数。那二者有什么不同呢？”国际标准化组织”也就是“ISO”, 其中有一个ISO2827“摄影电子闪光装置光输出和性能的测定”就分别定义了T0.5-有效闪光时间(Effective flash duration)和T0.1-完全 ...