(2.1) Use MuPad to show that
4^x-1 +2^2x-4/2^2x+1+ 5 x 2^2x-3 -10 = 5/42
(2.2) Use MuPad to prove that
2 cos 5x/sin 2x cos²x = -10 sin x + cos²x /in x = + 5 sin³ x/ cos² x