# precalc please help me

posted by
**dylan** on
.

If cos^4 3 x - sin^4 3 x = cos (g(x)), then

g(x) = ??.

For part (b), use a^4-b^4=(a^2-b^2)(a^2+b^2)!

posted by
**dylan** on
.

If cos^4 3 x - sin^4 3 x = cos (g(x)), then

g(x) = ??.

For part (b), use a^4-b^4=(a^2-b^2)(a^2+b^2)!