tan&=2,(3sin&-cos&)/(2sin&+3cos&)=?

tan&=2,(3sin&-cos&)/(2sin&+3cos&)=?
tan&=2,(3sin&-cos&)/(2sin&+3cos&)=?

tan&=2,(3sin&-cos&)/(2sin&+3cos&)=?
分子分母 同时除以 cos&
得到 3tan&-1/2tan&+3
等于3*2-1/2*2+3
等于 5/7