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HSC 2013 Maths Marathon (archive) (2 Viewers)

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Menomaths

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Re: HSC 2013 2U Marathon

It is a semicircle with a radius of 3.



Oh yeah I didn't see that :haha: isn't -4 < x < 4 the same as -3<= x <= 3 or am I going full retard?

edit: probs would've saw that if it was in latex lol
 

ocatal

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Re: HSC 2013 2U Marathon

Oh yeah I didn't see that :haha: isn't -4 < x < 4 the same as -3<= x <= 3 or am I going full retard?

edit: probs would've saw that if it was in latex lol
Haha no problem. Hmm that boundary would also include the numbers in between 3 and 4 (i.e. 3.1, 3.2 etc.) so I don't think its right.
 

Menomaths

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Re: HSC 2013 2U Marathon

Haha no problem. Hmm that boundary would also include the numbers in between 3 and 4 (i.e. 3.1, 3.2 etc.) so I don't think its right.
*Full retard mode activated*
 

Badsiii

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Re: HSC 2013 2U Marathon

Yea correct

----

(this one is different I assure you)




1-cosx= sin^2(x)/cos(x)
Cos(x) - cos^2(x)= sin^2(x)
Sin^2(x) + cos^2(x)=1
Hence, cos(x)=1
X=pi/2:)
 
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Menomaths

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Re: HSC 2013 2U Marathon

Are you allowed to put 0 in the RHS?
 
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