РЕШИТЕ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!cos(π- α)+ cos(3π/2+ α)/1+2cos(-α)∙sin(- α) .

Question

РЕШИТЕ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
cos(π- α)+ cos(3π/2+ α)/1+2cos(-α)∙sin(- α) .

Answer 1

Cos(π-α)+cos(3π/2+α)+2cos(-α)+sin(-α)= -cosα + sinα+2cosα-sinα=cosα