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+--- Thread: Brain Teaser (/Thread-Brain-Teaser)
Brain Teaser - PartyPaint - 08-27-2011
BRAIN TEASER
Hey guys, I thought about a little thread for some smart guys.
I'll post every day a new "brain teaser" and the winner of the day
get's +rep.
Rules
-no questions. send me pm.
-only 1 reply per "brain teaser"
-only 1 answer per "brain teaser"
Hey guys, I thought about a little thread for some smart guys.
I'll post every day a new "brain teaser" and the winner of the day
get's +rep.
Rules
-no questions. send me pm.
-only 1 reply per "brain teaser"
-only 1 answer per "brain teaser"
Let's start with something simple.
Solve this:
Code:
1+1+1+1+1+1+1-1+1+1+1-1+1+1+1+1+1x1+1+1+1+1-1+1+1+1+1RE: Brain Teaser - narc0tics - 08-27-2011
I like the idea behind this!
My guess would be 20.
RE: Brain Teaser - Frooxius - 08-27-2011
It's 20.
You call that a teaser? :lol: Just simple math :3
RE: Brain Teaser - PartyPaint - 08-27-2011
(08-27-2011, 08:29 PM)Frooxius Wrote: It's 20.
You call that a teaser? :lol: Just simple math :3
Yay, we have a winner. That was just an easy example.
I think about somthin difficult till tomorrow. (:
RE: Brain Teaser - 1llusion - 08-27-2011
20
=,= didn't see that coming... too late I guess =,=
RE: Brain Teaser - whitewolf - 08-28-2011
it sounds fun to me...i want to try guessing ur teaser
RE: Brain Teaser - whitewolf - 08-28-2011
it sounds fun to me...i want to try guessing ur teaser
RE: Brain Teaser - Shining White - 08-28-2011
Sin45+Cos90/tan45 = ????
one from me
( for begin )
RE: Brain Teaser - Shining White - 08-28-2011
Sin45+Cos90/tan45 = ????
one from me
( for begin )
RE: Brain Teaser - Frooxius - 08-28-2011
Shining White Holmse: Pfff, that's simple
Though you forgot to specify if the values are degrees or radians, but judging from the values, they're degrees.The result is:
sqrt(0.5) which is approximately 0,70710678118654752440084436210485
That's because it's the cos(90°)/tan(45°) results in zero, because cos(90°) is zero, so only sin(45°) is needed to calculate.
If you use a right triangle with hypotenuse length equal to 1 and with angle 45°, then two remaining sides are equal. Therefore:
c = 1
a = b = ?
Sides a and b represent sin(45°) and cos(45°) so
a = b = sin(45°) = cos(45°) = d
And from the Pythagorean we know that
c^2 = a^2 + b^2
Which is
1^2 = sin(45°)^2 + cos(45°)^2
But we know that they're equal so we can do this:
1 = d^2 + d^2
Which is
1 = 2(d^2)
And we need to know d, which equals both to sin(45°) and cos(45°), so we extract it:
1/2 = d^2
sqrt(1/2) = d
So we get
d = sqrt(0.5)
And we substituted sin(45°) with d so the final result is:
sin(45°) = sqrt(0.5)