数学题,求大神解答这个怎么解出来的,谢谢

2025-01-24 05:40:49
推荐回答(2个)
回答1:


回答2:

sinA=a/c

cosA=b/c

sin²A+cos²A

=(a/c)²+(b/c)²

= (a²+b²)/c² //勾股定理a²+b²=c²//

=c²/c²

=1