So I've managed to get the denominator correct, but the not the numerator! Where have I gone wrong?
Can you retype this using the square in this πr²h so it's not ^2 I'm getting confused Is it 16 divided by a squared minus 16 or 16 divided by a squared and then the fraction minus 16?
16/[(4secx)2-16] 16/16sec2x-16 split them up 16/16 * 1/1+tan2x - 16/16 (from the trig rule 1+tan2x = sec2x) 1 - 1 = 0 so you're left with 1/1+tan2x split that up 1/1 * 1/tan2x which is 1/tan2x = cot2x = c2
I think something may have gone a bit wrong in my method even though I obtained the right answer....