Another trig question ..

sin4feta=cos2feta

how do you write the equation in 2feta?

i have no idea how to write sin4feta as 2feta

thankyouuu

the fact that someone can get so far in education to be tackling such equations, yet think the character is spelt "feta", pretty much sums up how upset i am with maths education

in answer to your question - do you know the expansion of sin(A+B) ? It's no different, just that in this case A = 2theta, and B also = 2theta

i hate feta cheese.