tan∠A=42/250,求角A等于多少度?帮下忙!
问题描述：
tan∠A=42/250,求角A等于多少度?帮下忙!
答
tan∠A=42/250=0.168
arc tan 0.168
=9.5366357584594099859078453553719.°
=9°32.198145507564599154470721322313.‘
=9°32’11.888730453875949268243279338766.”