Question

Se x pertence ao intervalo [0;pi], então resolva 8 sen²(x) - 4 = 0.

Answer 1

8 sen²(x) - 4 = 0

sen²(x) =4/8

sen²(x) =1/2

sen(x) =1/√2 ==> x= π/4 ou sen(x) =-1/√2 ==>x π -π/4 =3π/4