Question

Resolva, em r, as equaçoes:
a) senx.cosx=1/4
b) sen4x + cos4x = 1

Answer 1

a) 2sex.cosx= sen(2x)
sendo assim
2senx.cosx=2/4

2/4=1/2
1/2=sen 30

Answer 2

2 sex.cos x=sen(2x) sendo assim
2 sem x.cos 2\4
   2\4=1\2

       1\2=sem 30