高一的一题数学求证三角函数题目.

3个回答

1+sin+cos+2sincos =sin^2+cos^2+sin+cos+2sincos
=(sin+cos)^2+sin+cos
=(sin+cos)(sin+cos+1)
1+sin+cos+2sincos 除以1+sin+cos ==(sin+cos)(sin+cos+1)除以1+sin+cos =sin+cos