与两个正切、余切恒等式相关的锐角三角形等效条件及其应用

与两个正切、余切恒等式相关的锐角三角形等效条件及其应用

SHU XUE JIAO XUE ›› 2013, Vol. 1 ›› Issue (8) : 27-28.

SHU XUE JIAO XUE ›› 2013, Vol. 1 ›› Issue (8) : 27-28.

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