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对于同角三角函数关系,在探究过程中不仅要知道是同角,还要掌握一定的技巧与方法.探究1“1”的代换,驭简于繁注意到
For the same trigonometric function, not only must we know the same angle in the process of exploration, but also have some skills and methods to explore .To explore 1 “1 ” substitution,