FP1 exercise 4E – 1/sqrt2 or sqrt2/2 for cos/sin 45 degrees? – The …

FP1 exercise 4E – 1/sqrt2 or sqrt2/2 for cos/sin 45 degrees? 2 hours ago 2h ago 1. Is it convention to put cos 45 (degrees) = 1/sqrt2 rather than sqrt2/2 – just spent …