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How did Maths 12 go? No discussion

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Any one remember the equations of line and curve where we had to find C? Also what was the tanTheta question part 2? Not ANSWER
 
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Tan theta was 2 and 3... I put the values of theta in the original equation and the equation was satisfied
 
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To find the coordinates of C i found the midpoint of AB and the gradient of AB. i used m1*m2=-1 to find the gradient of the perpendicular bisector, i used the coordinates of the midpoint AB to form an equation, then used the fact that a line is parallel to AB, so they share the same gradient but used here the coordinates (3,1), solved them simultaneously but comparing my answer to you guys, mine is incorrect, how many marks will i loose?
 
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