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EDEXCEL CORE 2 MAY 2016 - Unoffical Markscheme W/ Explained Answers watch

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    On 9 part d) I found out what x was, but completely forgot to find p using that. how many marks will i lose?
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    ALSO wth does 'solutions using geographical and numerical methods are not acceptable' mean
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    (Original post by ishaniss)
    ALSO wth does 'solutions using geographical and numerical methods are not acceptable' mean
    would i get method marks for writing equations
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    (Original post by DW4)
    From question 6, you said "You had to disregard the 2 value as it is larger than one leaving sin^-1 of 1/4 which was 14.5." but it's: sin^-1 of -1/4 which was -14.5.
    Yeah!! But as long as you account for it being negative in the cast diagram it's ok! XD
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    (Original post by b0bzzta)
    1. Hey can anybody go through the trig identities question, it was 1-2cos(theta-PI/5) = 0 then ii) was 4cos^2x + 7sinx-2=0 i think for 0<=x<=360
    Great memory of the questions!!!
    Question 1 you had to do some rearranging and you ended up you cos(theta-Pi/5) = 1/2. You then had to let y = (theta-Pi/5) and proceed to solve.

    This requires more manipulation.
    You know that cos^x + sin^x = 1 therefore cos^x= 1 - sin^2x
    Substitute in to get 4(1-sin^2x) + 7 sinx - 2=0
    4-4sin^2x + 7sinx - 2 =0
    4 sin^x -7 sinx - 2 = 0 and let y = sin X
    4y^s - 7y - 2 = 0
    (4y+1)(y-2) = 0
    Y = -1/4 or 2 and ignore the 2 then do cast
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    great😕
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    (Original post by ishaniss)
    On 9 part d) I found out what x was, but completely forgot to find p using that. how many marks will i lose?
    probably 2
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    Care to explain question 8 pleaseeeee.
 
 
 
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