Come giudichi # Tan ((3pi) / 4) #?
Risposta:
#tan((3pi)/4)=-1#
Spiegazione:
#(3pi)/4=pi-pi/4#
#a=pi#
#b=pi/4#
#tan(a-b)=(tan a-tan b)/(1+tan a*tan b)#
#tan((3pi)/4)=(tan pi-tan (pi/4))/(1+tan pi*tan (pi/4)#
#tan((3pi)/4)=(0-1)/(1+0*1)#
#tan((3pi)/4)=-1/1#
#tan((3pi)/4)=-1#