计算1sin50°+3cos50°=______．_数学解答

计算

sin50°

cos50°

=______．

人气：214 ℃　时间：2020-03-29 08:20:22

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...