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| 1. |
If Angle A and Angle B are acute angles such that cosA=cosB, then show that angle A =angle B? |
| Answer» 《C= 90°,,,,,, cosA=AC/AB,,,,,,,cosB=BC/AB,,,,,,as given cosA=cosB ,,,,,,,,so,,,,AC/AB=BC/AB,,,,so,,,AC=AB,,,,《A=《B | |