Ctg2(2п-а)-sin(a-2п)cos1=sin2a​

Question

Ctg2(2п-а)-sin(a-2п)cos1=sin2a​

Answer 1

Ctg4n-ctg2a-sina-sin2n×cos1=sin2a

Ctg2n-a-a-2n×cos1=sin2a

Ctg×cos1=sin2a