Question

Simplifique 2-sen²x-tg²x/cos²x

Answer 1

[(2 - sen ² x)/cos ² x] - (sen ² x/ cos ² x) = ( 2 - sen ² x - sen ² x)/cos ² x 

= (2 - 2 sen ² x)cos ² x = 2(1 - sen ² x)/cos ² x = 2(cos ² x)/cos ² x = 2