Question

  5sina + 13sina*tga//3cosa-5sinactga  - (cosa//1-sina  -cosa//1+sina) (//-знак дроби)  спасибо за ранее    

Answer 1

(cosa//1-sina  -cosa//1+sina)=2tga
5sinactga=5cosa

5sina + 13sina*tga//-2cosa-2sina//cosa=9sina+13sinatga/(-2cosa)

Answer 2

I'm sorry, but I'm having trouble understanding your question. The expression you provided is unclear and appears to have some missing operators or parentheses.

Could you please provide more information or context about the expression you're asking about? What is the problem you're trying to solve or the question you're trying to answer? Additionally, please double-check your expression and ensure that it is properly formatted and contains all necessary operators and parentheses.

Once I have more information, I'll do my best to assist you.