[ 1 + sin (360° - a) ][ 1 + cos (90° - a) ]/sin (90° - a) =
= ( 1 + sin(-a) ) ( 1 + sin a )/cos (a) =
= (1 - sin a)(1 + sin a)/cos(a) =
= (1 - sin^2(a))/cos(a) =
= cos^2(a)/cos(a) =
= cos (a)
Home
Profilo
Menu