This is more difficult, I see familiar things (formulas basically behind numbers), but end with different result. How it is good to start simplifying it?
Things what I see:
same thing with:
I am not sure about this one:
Going inside parenthesis:
Common denominator in my opinion is:
Ready to divide (which is multiplication with opposite number):
I know it looks crazy.
I calculated it and got as final result:
Interesting, but when I set a = 1 my simplification and textbook answer give different results. I went wrong, tips how I should approach it?