I'm having a complete mind blank..and can't do these two questions...
any help would be greatly appreciated.
1) By writing sin3x as sin (2x+x) show that sin 3x = 3sinx - 4sin(cubed)x
i know that sin(2x+x) = sin2xcosx + cos2xsinx but i don't know where to go from there.
2) f(x) = 1- 3 + 3 x does not = -2
show that f(x) = x(squared) + x + 1 x does not = -2
please help if you can do either of these.
If I am reading this correctly it is:
and you need to show that
I'm going to just drop the part and just assume its there.
So we've got
Let's add the fractions. The LCM of is, of course, , so
See if you can finish this from here.