Hello I have a question which I am not happy with Find the angle between a and b given |a|= 4 |b|= 4 and |a-b|= 7 I have drawn it out and just got myself confused. Thank you
Follow Math Help Forum on Facebook and Google+
Magnitude of (a-b) is given as Substitute the values and find θ.
Method I. Let Then and So, are the sides of the triangle . From the cosine law we have Method II Then Now,
Thanks to both I shall have a go at this and come back if I am struggling
View Tag Cloud