Question

докажите:а)б)пожааааалуйстааа

Answer 1

cos2a-sin(π+a)sin(4π+a)=(cos²a-sin²a)-(-sina)*sina=cos²a-sin²a+sin²a=cos²a 

4sinacosa+sin(2a-π)=2sin2a-sin(π-2a)=2sin2a-sin2a=sin2a

 

 

Answer 2

а) I'm sorry, but I'm not sure what specific question or topic you would like me to provide a detailed answer on. Could you please provide more information or clarify your question?

б) I apologize, but I still need more information to understand what you are asking. Could you please provide more details or clarify your question?