[Official Thread] OCR MEI AS Mathematics 2016 (C1, C2 & S1)

1.8 I believe? Probably wrong though!

What was the value of theta for the sector question again? I remember somewhat that the radius was 12

1.8 I believe? Probably wrong though!

Sin(X)=0 for 0,180, and 360

Sup, did exactly the same, you and I both integrated the value before the brackets right? You're not meant to do that, if you carried on and multiplied it by 50 then we'll probably get W for method marks

Not supposed to integrate 8/51 or whatever it was? How come?

5/81

When integrating, a constant value which applies to the whole integral can be put outside of the integral before integrating

Oh crap I remember learning that but that didn't come up in any of my textbooks (retaker). Oh well.

With the sin graph translation did you guys move it 3 units down. There were no brackets so I was unsure?

It was 0.8

1.8 I believe? Probably wrong though!

Its a differentiation by first principles question.

Q:
y = x^2 - 2x
find dy/dx on the chord between x=5 and x=5.1.

A:
8.1

Q:
given that f(x) = x^2 - 2x
find (f(5+h) - f(5))/h

A:
sub 5+h for x:
(5+h)^2 - 2(5+h) = 25+10h+h^2 -10 -2h = 15 +8h +h^2
minus f(x) sub 5 for x:
15+8h+h^2 - (25-10)= 8h+h^2
Divide by h:
8 + h

Q:
gradient at x=5

A:
deltay/deltax = 8 + h
as h tends to 0, gradient tends to 8, so dy/dx = 8

I left it as 8h+8h^2
At first I couldn't see why you did that then I saw it was in the original equation, made so many stupid mistakes like this!
Will I just lose 1 mark?

Can someone explain why I only got two values? thanks

It actually comes up much more in C3 - surprised it was put into C2

for the simplifying log question i got -3m
is this familiar to anyone?!