Question

Aratati ca $sin^{2}$30 de grade +$cos^{2}$45 de grade =3/4

Answer 1

sin^30= (1/2)^2= 1/4, cos^2 45= (rad2/2)^2= 2/4=1/2, deci 1/4+1/2= 1+2/4= 3/4, ceea ce trebuia de demonstrat!