Question

упростить выражение  2cos(п-а)+((sin a + tg a )/ tg a )^2 - cos^2 a

 

                                                               

                                                             

Answer 1

2cos(п-а)+((sin a + tg a )/ tg a )^2 - cos^2 a=-2cosa+(cosa+1)^2-cos^2a=-2cosa+cos^2a+1+2cosa-cos^2a=1