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一类三角形有解的充要条件５６３０００贵州省遵义市第四中学廖其伟先看一道例题：例１在△ＡＢＣ中，已知，．则ＣＯＳＣ的值为（Ａ）或（Ｂ）（Ｃ）（Ｄ）以上都不对此题由于不汪意三角形中角的范围，会误造Ａ，有一定的迷惑性．各种资科上都有类似题目．真解法都大体如...
A necessary and sufficient condition for the solution of a type of triangle is 563000 Liao Qiwei, the No. 4 Middle School in Zunyi, Guizhou province, see an example: Example 1 is known in △ABC. Then the value of COSC is either (A) or (B) (C) (D). None of this is due to the range of corners in the triangle. Various resources have similar topics. The true solution is roughly as...