34*Sin^2[x]+Sin[2*x]-8*Cos^2[x]==4

Could someone help me with this equation?
Thx

Try using the identities, sin(2x)=2sin(x)cos(x)

1-cos^{2}(x)=sin^{2}(x), \;\ 1-sin^{2}(x)=cos^{2}(x)

Whittle it sown and use a substitution.