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March 29, 2024, 01:16:03 am

Author Topic: Mathematics Question Thread  (Read 1296740 times)  Share 

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BPunjabi

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Re: Mathematics Question Thread
« Reply #525 on: October 15, 2016, 05:52:33 pm »
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How do you do these questions?

How many solutions of the equation (sin x – 1)(tan x + 2) = 0 lie between 0 and 2π ?
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jakesilove

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Re: Mathematics Question Thread
« Reply #526 on: October 15, 2016, 05:57:06 pm »
+1
How do you do these questions?

How many solutions of the equation (sin x – 1)(tan x + 2) = 0 lie between 0 and 2π ?

Hey! For that equation to hold true, either



or



Looking to the first equation,




Looking to the second equation




So those should be our three solutions!
« Last Edit: October 15, 2016, 06:08:33 pm by jakesilove »
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RuiAce

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Re: Mathematics Question Thread
« Reply #527 on: October 15, 2016, 06:14:28 pm »
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How do you do these questions?

How many solutions of the equation (sin x – 1)(tan x + 2) = 0 lie between 0 and 2π ?





BPunjabi

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Re: Mathematics Question Thread
« Reply #528 on: October 15, 2016, 06:15:15 pm »
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Hey! For that equation to hold true, either



or



Looking to the first equation,




Looking to the second equation




So those should be our three solutions!

Sorry man the answers says 2. Its multiple choice question 7 for the 2014 paper. Also could you explain to me how you quickly worked out the fractions for the solutions like:



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nibblez16

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Re: Mathematics Question Thread
« Reply #529 on: October 15, 2016, 06:16:54 pm »
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Hello, can you please help me with HSC 2007 question 7a(i)... Its a little confusing....

RuiAce

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Re: Mathematics Question Thread
« Reply #530 on: October 15, 2016, 06:17:23 pm »
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Sorry man the answers says 2. Its multiple choice question 7 for the 2014 paper. Also could you explain to me how you quickly worked out the fractions for the solutions like:




Anyway, I explained his mistake.

BPunjabi

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Re: Mathematics Question Thread
« Reply #531 on: October 15, 2016, 06:19:22 pm »
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Anyway, I explained his mistake.

Sorry I quoted and said the wrong thing... I meant the answers for the second part. When I put those values into my calc it does not equal exactly zero, and is there a way to figuring it out fast?
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RuiAce

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Re: Mathematics Question Thread
« Reply #532 on: October 15, 2016, 06:20:22 pm »
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Hello, can you please help me with HSC 2007 question 7a(i)... Its a little confusing....
In the future, please provide a link to the paper.




RuiAce

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Re: Mathematics Question Thread
« Reply #533 on: October 15, 2016, 06:21:10 pm »
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Sorry I quoted and said the wrong thing... I meant the answers for the second part. When I put those values into my calc it does not equal exactly zero, and is there a way to figuring it out fast?
2.03 and 5.18 are obviously rounded.

BPunjabi

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Re: Mathematics Question Thread
« Reply #534 on: October 15, 2016, 06:23:53 pm »
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2.03 and 5.18 are obviously rounded.

Yes but can you please tell me how you get that answer quickly... you dont just randomly test those points in your calculator.. there must be some method to getting those values.

Thanks,
Bobby
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RuiAce

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Re: Mathematics Question Thread
« Reply #535 on: October 15, 2016, 06:25:13 pm »
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Yes but can you please tell me how you get that answer quickly... you dont just randomly test those points in your calculator.. there must be some method to getting those values.

Thanks,
Bobby




asd987

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Re: Mathematics Question Thread
« Reply #536 on: October 15, 2016, 06:30:15 pm »
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help plz   A rectangle is cut from a circular disc of radius 6 cm. Find the area of the largest rectangle that can be produced

nibblez16

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Re: Mathematics Question Thread
« Reply #537 on: October 15, 2016, 06:34:40 pm »
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In the future, please provide a link to the paper.





Thank You so much!
Sorry, I'll provide a link next time... Thanks :)

RuiAce

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Re: Mathematics Question Thread
« Reply #538 on: October 15, 2016, 06:45:59 pm »
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help plz   A rectangle is cut from a circular disc of radius 6 cm. Find the area of the largest rectangle that can be produced






RuiAce

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Re: Mathematics Question Thread
« Reply #539 on: October 15, 2016, 07:58:15 pm »
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hi, i always get stuck when it comes to drawing the derivative function of a graph, has anyone got any tips to draw these?
Be more specific please? If you're given the function, say, f(x)=x3+3x2 then all you have to do is differentiate it and then continue.

Do you mean drawing the graph of the derivative, given the graph of the original thing?