sin^2a+sin^2b=sin^2c 则△ABC为

问题描述:

sin^2a+sin^2b=sin^2c 则△ABC为
直角/等腰直角/等边/等腰?

(sina)²+(sinb)²=(sinc)²=[sin(180°-a-b)]²=[sin(a+b)]²=(sinacosb+cosasinb)²(sina)²+(sinb)²=(sina)²(cosb)²+(cosa)²(sinb)²(sina)²(cosb)&su...