MedVision ad

impossible maths questions (3 Viewers)

harism

New Member
Joined
May 9, 2008
Messages
25
Gender
Male
HSC
2009
omg.
OH YEA!
date shall be changed. OH DEF :p
 

supermike

Member
Joined
Feb 9, 2009
Messages
55
Gender
Male
HSC
N/A
jeez five pages of posts for sth like this???? time for some serious self reflection guys, be ashamed of urselfs...
 

tommykins

i am number -e^i*pi
Joined
Feb 18, 2007
Messages
5,730
Gender
Male
HSC
2008
prove cos^2 @+ sin^2 @ = 1

lawl. you can't use that proof aye
 

pman

Banned
Joined
Apr 7, 2009
Messages
2,127
Location
Teh Interwebz
Gender
Male
HSC
2009
Question 1 =3
question 2 = a big white stain
question 3=4 or 5, depending on the situatuion
 

ninetypercent

ninety ninety ninety
Joined
May 23, 2009
Messages
2,148
Location
Sydney
Gender
Female
HSC
2010
prove cos^2 @+ sin^2 @ = 1

lawl. you can't use that proof aye
Let the side of a triangle be r and p. the hypotenuse is therefore, root r^2 + p^2

cos x = r/ (root r^2 + p^2)
sin x = p/ (root r^2 + p^2)

cos^2x + sin^2x = r^2/(r^2 + p^2) + p^2/(r^2 + p^2)

therefore, cos^2x + sin^2x = 1
 

untouchablecuz

Active Member
Joined
Mar 25, 2008
Messages
1,693
Gender
Male
HSC
2009
Let the side of a triangle be r and p. the hypotenuse is therefore, root r^2 + p^2

cos x = r/ (root r^2 + p^2)
sin x = p/ (root r^2 + p^2)

cos^2x + sin^2x = r^2/(r^2 + p^2) + p^2/(r^2 + p^2)

therefore, cos^2x + sin^2x = 1
prove pythagorus' theorum :p
 

untouchablecuz

Active Member
Joined
Mar 25, 2008
Messages
1,693
Gender
Male
HSC
2009
prove that this will go on and on. (induction preferred XD)
related theorum: nothing can be proved indefinately

s(n): this will continue on n times

A. Consider s(1). This has to this point continued on 1 time. Hence s(1) true.

B. Assume s(k) true. That is, this has continued on k times.

Consider s(k+1). It already continue on k times (induction assumption), and since nothing can be proven indefinately, it will have to continue on for at least one more time. Hence this will continue on k+1 times.

C. It follows from parts A and B, by induction, that s(n) is true.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 3)

Top