I'll try to translate these questions to the best of my ability, since it's originally written in Swedish. (there's a distinct lack of online math discussion over here for some reason) I have 2 questions in total.
Here it goes;
1- I have to calculate the exact value of sin(105). How do I do that?
2- I need to calculate the "area" between these two f(t)=13t-5t^2 and f(t)= 1/2t
All help is appreciated!
I shall help you with the first problem.
We know, sin60=√3/2, cos45=1/√2, cos60=1/2, sin45=1/√2
Therefore, Sin(105)=√3/2√2+1/2√2= (√3+1)/2√2
= (approximately) 0.9659
It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.