Easy -1.2 This is a straightforward geometric demonstration requiring students to draw an isosceles right-angled triangle with sides 1:1:√2 and apply the definition of cosine. It's a standard textbook exercise testing basic understanding of trigonometric ratios with minimal problem-solving required, making it easier than average.
Question 2:
2 | using Pythagoras to show that hyp.
of right angled isos. triangle with
sides a and a is √2a
completion using definition of cosine | M1
A1 | www
a any letter or a number
NB answer given | 2