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Exam 2 Question

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costargh:
Exam 2 Question

Question 8 VCAA 2006 exam 2
The average value of the function y=cos (x)  over the interval [0, pie/2] is
A. 1/pie

B. pie/4

C. 0.5

D. 2/pie

E. pie/2


Does this have to be done by hand, can it be done using cas or graphically?
Itute gives some wierd explanation that i dont even think is for the same question lol
Q8 y = log3 (x); after reflection in the x-axis, y = − log3 (x);
after translation by 5 units up and translation 2 units right,
log3 ( 2) 5 y = − x − + .
(Will we need to know how to do this by hand also?)

Collin Li:
[ cos(pi/2) - cos(0) ] / (pi/2 - 0)

enwiabe:
That's not the answer for that question :S

costargh:
Yeh I think Itute made a mistake. Ok so just sub in the intervals and minus them? ok cool =)

costargh:
Ummm maybe Im doing something wrong but isnt [cos(pi/2)- cos(0)] /2 = -1/2?

And the VCAA answer is  D. 2/pi

=S

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