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Paper 12 maths

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haha in the trig question, I wrote about 5 different degrees in the range of -180 to 180
 
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what was the last question like was it f(g)x? and what was g(x)? I solved this by b^2-4ac, is that right?
 
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wasn't the plate the circular sector? (without the triangular part?)

I'm afraid you're erroneous. The plate was circular with a vertical edge made by chord (AB) and not the 'dotted' circular sector which looked somewhat like Pacman.;)
The area is 146 cm^2 (correct to 3 s.f)
 
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what was the last question like was it f(g)x? and what was g(x)? I solved this by b^2-4ac, is that right?

g-1(x)= (8/x) + 3 (x=/0)
you solve for the range of k by supposing the discriminant: b^2 -4.a.c<0
>> 0<k<(64/9)
 
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can anyone explain me how they got the answers for trigonometry question.
 
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My paper went very good, I'm hoping for something in the 70s if not full (I hate how elitist that sounds but meh :\) but yeah, I agree that the paper was quite tough and the grade threshold will definitely be low (probably 58-60 maybe).
I thought the paper was much easier than last year's .. except for 7a) everything made sense
 
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I'm afraid you're erroneous. The plate was circular with a vertical edge made by chord (AB) and not the 'dotted' circular sector which looked somewhat like Pacman.;)
The area is 146 cm^2 (correct to 3 s.f)
but but .. it said, "the plate was made by removing a triangular piece"... or somethin like that! ='[ .. I wrote 146 .. then re read the question and changed both answers I thin *sobsniffcry*
 
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In this one shaded areas were removed... but in the paper the question already had the part removed which wasnt shown ..... leaving behind the triangle and the remaning sector of circle :)
 
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When i solved the ap question i got d =1 and i put it in the equation and got a=9 ...how can u get a=9 if u get d=2 ?
 
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does anyone remember what vectors OA and OB were?
I don't exactly remember but I think OA was twice the magnitude of one of the vectors given in the question, and OB was thrice the magnitude of the other vector provided in the question. The final answer was something like 1/√61 (-5i + 6j).
 
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