Come si semplifica l'espressione # tan ^ 2x / (secx + 1) #?
#tan^2 x=sec^2 x-1=(sec x+1)(sec x -1)#
#rArr tan^2 x/(sec x+1)=sec x-1, or, =(1-cos x)/cos x#,
#tan^2 x=sec^2 x-1=(sec x+1)(sec x -1)#
#rArr tan^2 x/(sec x+1)=sec x-1, or, =(1-cos x)/cos x#,