Calcule o valor do determinante.

regras básicas da trigonometria,

sen(180-x)=senx

cos(90-x)=senx

sen(90-x)=-cosx

cos(180-x)=cosx

cos392=cos(392-180)=cos212=cos32=cos(90-32)=sen58

sen122=sen(122-90)=cos32

sen56=cos(90-56)=cos34

Det=cos34*cos392-cos34*cos32

Det=cos34*cos32-cos34*cos32

Det=0

Letra B