But doesn't the squre inside the squareroot eliminate any possible negative values derived from cos, hence shouldn't squareroot of (square of cosx) be just cosx!
I know the solution above by you is correct, but just finding it difficult to understand the concept behind it.
example...
This might sound stupid, but can someone explain why in the above solution:
the (root of cos^2 x) = Absolute value of (cos x) and not just cosx
Why the absolute value?
IF you are only doing 12 units, then why not keep the General maths since you find it easy anyway - (you will not need to spend too much time revising on the work to do well ).
Should always have some spare units on the side just incase.
On the other hand, If you are not listening or...
Only one 6 means (1st die is a 6, 2nd is not a 6) or (1st die not a 6, 2nd die is a 6).
Which gives
P(one 6) = 1/6*5/6 + 5/6*1/6 = 5/18
This would be the same if you drew a tree diagram!
Any Cambridge textbooks!
Hmmmm
Cambridge Mathematics 4 Unit by D. Arnold and G. Arnold
Solutions by Sami El Hosri
http://www.geocities.com/arnoldsol/
Thanks to boredofstudies link source :"D. R. Buchanan"
Don't know about the 2 or 3 unit solutions - sorry!
:o
Look at it in the reverse sense
If COS (A) = 2/3
than
. A = Cos^-1 (2/3)
It's exactly the same thing right!
:confused: ??? I think????
Can you smell what the ROCK is cooking! Ke ke ke ke