Exam 1 Discussion

[nikil.v]

Isn't -1/4ln(2) = 1/4ln(1/2)??
And in last question since as the angle increases, 5g/(cos(theta)) increases (denominator decreases), wouldn't 5g/cos(theta) be greater than 10g (98) for theta>pi/3??

Sorry, I mean 1/4 ln 2 instead of 1/2ln2, not 1/4 ln (1/2) - also, cos decreases as the angle increases (is it goes from 1 to 0)

[Robert123]

I'm so curious as to how we were supposed to prove sec(theta)>tan(theta) mathematically......?

The way I interpreted was that T1>T2 then subbing in your answers from the previous two questions would lead to tan(theta)<sec(theta)
What do people reckon the A+ cut off would be for this year? I'm hoping lower than last (38/40) as there were several annoying arithmetic questions and some subtle traps. Did anyone else realise the restricted domain of the graph?

[Aman476]

A+ cut off 39?

I reckon, and i lost 2 marks so fuck, there goes any chance of 46/47

[t101]

Do you reckon it's enough to show that sec(theta) = tan (theta) at theta = pi/2 then show in that interval tan theta is less then sec theta . And as theta has to be greater than 0, theta is between 0 and pi/2 for tan theta is less then sec theta

[Aman476]

Sorry, I mean 1/4 ln 2 instead of 1/2ln2, not 1/4 ln (1/2) - also, cos decreases as the angle increases (is it goes from 1 to 0)

exactly so 1/cos(theta) increases

[keltingmeith]

A+ cut off 39?

Surely that exam wasn't easier than last year's?

[Aman476]

Surely that exam wasn't easier than last year's?

haha i actually think it was haha

[forchina]

 I completely stuffed up the 2nd question. I thought the angle would be square root (3/2) as i did value of k over value of i. Is that 2 marks completely off?

[keltingmeith]

Do you reckon it's enough to show that sec(theta) = tan (theta) at theta = pi/2 then show in that interval tan theta is less then sec theta . And as theta has to be greater than 0, theta is between 0 and pi/2 for tan theta is less then sec theta

Probably should be fine if it was just for the fixed interval (0,pi/2]. It also depends on how you showed it, and what the question said.

-DISCLAIMER: I have not seen the paper. I can only comment on what you write here-

[Brunette15]

Is there any way we can get solutions up with the exam questions like for methods?

[keltingmeith]

Is there any way we can get solutions up with the exam questions like for methods?

Yes - get me a copy of the paper, and I will do solutions for the whole thing.

[Mujteba]

Also range for 3xarctan(2x) was [0,infinity)

[Aman476]

Is there any way we can get solutions up with the exam questions like for methods?

I asked my stupid exam supervisor for a blank exam (so i could post it and let one of the freaks on the site do it) and she said "im not allowed to give you one' - whattaa bishhh obviously she can

[Brunette15]

Yes - get me a copy of the paper, and I will do solutions for the whole thing.

Can someone please upload a copy haha 

[Aman476]

Im still confused on last question - did anyone else get pi/3?