I'm having trouble simplifying this.
I got:
[(4pi/5)^3 / 3] - [COSpi4/5] - [(-4pi/5)^3 / 3] - [-COS(-4pi/5)]
I think the COS term will cancel out and then we get 2[(4pi/5)^3 / 3] as the answer.
Things I am not sure about: the signs. I'm not sure about:
- [-COS(-4pi/5)] *** does this become positive? What about the -4pi/5?
Okay I think I got it, the COS part cancel out leaving just the 4pi/5 parts.
My end result is then:
[(4pi/5)^3 / 3] + [(4pi/5)^3 / 3]
I am trying to simplify this and have some trouble. I turned it into:
2 * [(4pi/5^3) * 3]
Can it be simplified further?
Skipping the details here, the format above would then be the first term with pi - cosine term + second pi term + second cosine term.
The is the most I can simplify it: 2 * [(4pi/5^3) * 3]
How does this look? Basically the cosine terms cancel out and leaves just 2 times the pi terms.