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Subscriber commentsSee all

  • 31 May 2024
    Barbara Kušar
    Vectors HL
    Hi Tim, thanks for your answer. My point was that in calculating an angle one would use equation cosA=|a b /  (|a| |b|) |. In this case the other soution (a=0) would also hold. And in this case we would obtain vector (1,0,-1) whose angle...
  • 30 May 2024
    Tim Garry
    Vectors HL
    Hi Barbara, Thanks for your comment about Q.3, part (d) on Test1 HL Vectors. Not sure I'm interpreting your comment corectly. There actually is no angle calculation because it is given that the angle between the plane and line L3 is 30 degrees;...
  • 27 May 2024
    Barbara Kušar
    Vectors HL
    Dear Tim, regarding solution a=0 problem 3d, Test # 1, you are right it is not the solution to equation 1/2 = (a-1)/sqrt(2aa + 4), but shouldn't there be an absolute value when calculating the angle beetwen a line and a plane to ensure an acute...
  • 13 May 2024
    Tim Garry
    Integration basics
    Hi Vipul, Thank you for pointing this out. The exercise set with integration exam-like questions should not have been categorized as suitable for SL because - as you stated - solids of revolution are not in the SL syllabus. I have re-categorized...