How would you express f(x) = cos3(x) in terms of first powers only? Please explain the steps
change to Cos2(x) * Cos (x)
Then, reduce the cos2 by using
cos2(x)= 1/2 + 1/2 cos (2x)
check that.
Then, reduce the cos2 by using
cos2(x)= 1/2 + 1/2 cos (2x)
check that.