题目内容：

计算

1

sin50°

+

3

cos50°

=______．

优质解答

1sin50°+3cos50°=cos50°+3sin50°sin50°cos50°=2(12cos50°+ 32sin50°)sin50°cos50°=2(sin30°cos50°+  cos30°sin50°)sin50°cos50°=2sin(30°+50°)sin50°cos50°=2sin80°sin50°cos5...