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March 28, 2024, 09:44:04 pm

Author Topic: Mathematics Question Thread  (Read 1296665 times)  Share 

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FallonXay

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Re: Mathematics Question Thread
« Reply #630 on: October 19, 2016, 04:46:39 pm »
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Hiya. How do you do b) part (ii) of this question?

Thanks.  :)
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RuiAce

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Re: Mathematics Question Thread
« Reply #631 on: October 19, 2016, 06:22:44 pm »
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Hiya. How do you do b) part (ii) of this question?

Thanks.  :)



FallonXay

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Re: Mathematics Question Thread
« Reply #632 on: October 19, 2016, 07:33:28 pm »
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With this question,  how come the little 'triangle' section  under the semi circle is shaded? Doesn't the region of the semicircle stop at the x axis?

Thankyou!
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RuiAce

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Re: Mathematics Question Thread
« Reply #633 on: October 19, 2016, 07:45:24 pm »
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With this question,  how come the little 'triangle' section  under the semi circle is shaded? Doesn't the region of the semicircle stop at the x axis?

Thankyou!



And then you're combining regions.


SimplyNikhil

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Re: Mathematics Question Thread
« Reply #634 on: October 19, 2016, 07:49:59 pm »
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Hey, can someone please show how to do this question?
Thanks in advance!

RuiAce

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Re: Mathematics Question Thread
« Reply #635 on: October 19, 2016, 07:52:20 pm »
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Hey, can someone please show how to do this question?
Thanks in advance!


RuiAce

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Re: Mathematics Question Thread
« Reply #636 on: October 19, 2016, 07:54:34 pm »
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Makes sense, but then why is the range for semicircles always stated between 0 and some number (i.e in this case stated as between 0<=y<=3 instead of just y<=3?)

FallonXay

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Re: Mathematics Question Thread
« Reply #637 on: October 19, 2016, 07:56:51 pm »
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Rikahs

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Re: Mathematics Question Thread
« Reply #638 on: October 19, 2016, 08:11:51 pm »
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Hi everyone,

I have attached a pic below (sorry for sloppy drawing). Let point D be the midpoint of hypotenuse BC. If in HSC you say CD=AD=AB (Midpoint of hypotenuse is equidistant from vertices of triangle ABC). Is the part in the brackets a valid proof or would you have to prove AD= CD or AD= DB another way.

Thanks
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jakesilove

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Re: Mathematics Question Thread
« Reply #639 on: October 19, 2016, 08:17:55 pm »
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Hi everyone,

I have attached a pic below (sorry for sloppy drawing). Let point D be the midpoint of hypotenuse BC. If in HSC you say CD=AD=AB (Midpoint of hypotenuse is equidistant from vertices of triangle ABC). Is the part in the brackets a valid proof or would you have to prove AD= CD or AD= DB another way.

Thanks

Personally, I would suggest that that you prove it another way, because it isn't a 'classic' 2U proof. As such, markers may not be happy with you 'assuming' things beyond the curriculum.
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RuiAce

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Re: Mathematics Question Thread
« Reply #640 on: October 19, 2016, 08:22:34 pm »
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Hi everyone,

I have attached a pic below (sorry for sloppy drawing). Let point D be the midpoint of hypotenuse BC. If in HSC you say CD=AD=AB (Midpoint of hypotenuse is equidistant from vertices of triangle ABC). Is the part in the brackets a valid proof or would you have to prove AD= CD or AD= DB another way.

Thanks
Definitely not. The midpoint on a hypotenuse theorem is not assumed and you need to prove it from what you're given

rahaf

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Re: Mathematics Question Thread
« Reply #641 on: October 19, 2016, 09:02:11 pm »
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Hi! Can somebody help me with this please.

RuiAce

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Re: Mathematics Question Thread
« Reply #642 on: October 19, 2016, 09:16:44 pm »
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RuiAce

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Re: Mathematics Question Thread
« Reply #643 on: October 19, 2016, 10:09:28 pm »
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Saw that but was wondering how is there 2 solutions??? I understand sinx-1=0 but how do you solve the tan one. How do you know it has two solutions?



Deng

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Re: Mathematics Question Thread
« Reply #644 on: October 19, 2016, 11:32:15 pm »
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Hey guys, i was wondering if anyone could help give me iron out some stuff: e.g

locus and parabola for y^2=4ax, is the directrix y=-a and the focus (x+ or - a, y). For some reason i cant grasp the y^2 side despite knowing how the x^2 side works

This may be hard to explain but how would i graph velocity graphs ? I can work out the intercepts and roots, but i get stumped when wondering how to draw them and i dont necessarily have a question on hand

The sum and product of roots and the variations outside of alpha + beta, alpha beta, there is one of them which i cant exactly remember ( which i know isnt helpful in trying to get help for) but its a more 'complex' one that requires a bit more algebraic manipulation

Thanks
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