Mathematics
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OpenStudy (anonymous):
Find the exact value of tan inverse
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OpenStudy (anonymous):
OpenStudy (unklerhaukus):
tan theta = opp / adj
OpenStudy (unklerhaukus):
(there is no inverse)
OpenStudy (anonymous):
this is a dumb question.. but what does the theta sign look like?
OpenStudy (unklerhaukus):
theta : \(\theta\)
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OpenStudy (anonymous):
that's the sign I used but I thought it meant inverse :0
OpenStudy (unklerhaukus):
\[\tan(\theta) = \frac{\text{opposite}}{\text{adjacent}}\]\[\Downarrow\]\[\theta = \tan^{-1}\left(\frac{\text{opposite}}{\text{adjacent}}\right)=\arctan\left(\frac{\text{opposite}}{\text{adjacent}}\right)\]
OpenStudy (unklerhaukus):
the question is only asking you to find \(\tan\theta\),
you don't have to compute the value of theta,
OpenStudy (anonymous):
It's saying the equation has too many equal signs
OpenStudy (unklerhaukus):
what is the length of the side opposite to theta in the diagram?
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OpenStudy (anonymous):
is 6 the opp and 2 and 5 the adj?
OpenStudy (unklerhaukus):
yes,
opp = 6
and
adj = 2√5
OpenStudy (anonymous):
my calculator said it was 1/2 as the answer, but it said that 1/2 is not correct
OpenStudy (unklerhaukus):
\(\tan\theta = \dfrac{6}{2\sqrt 5}\)
OpenStudy (unklerhaukus):
now cancel the common factor
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OpenStudy (anonymous):
what's the common factor?
OpenStudy (unklerhaukus):
\[\tan\theta = \dfrac{6}{2\sqrt 5}=\dfrac{2\times3}{2\times\sqrt 5}=\]
OpenStudy (anonymous):
\[\tan \emptyset \frac{ 6}{ 5 }=\frac{ 3 }{ 5 }\]
OpenStudy (unklerhaukus):
now rationalize the denominator
\[\tan\theta = \frac{6}{2\sqrt 5}=\frac{3}{\sqrt 5}=\frac{3}{\sqrt 5}\times\frac{\sqrt5}{\sqrt5}=\]
OpenStudy (anonymous):
20..?
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OpenStudy (unklerhaukus):
\[\frac{3}{\sqrt 5}\times\frac{\sqrt5}{\sqrt5}=\frac{3\times\sqrt5}{\sqrt5\times\sqrt5}\]
now simplify the denominator
OpenStudy (anonymous):
would it be 1 because 5 can go into 5 once?
OpenStudy (unklerhaukus):
\[\sqrt5\sqrt5=\sqrt5^2= .....\]
OpenStudy (anonymous):
i'm not even sure how to go about that :o
OpenStudy (unklerhaukus):
\[√x^2 = x\]
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OpenStudy (anonymous):
oh gosh
OpenStudy (unklerhaukus):
ikr
OpenStudy (anonymous):
OpenStudy (anonymous):
my options don't even make sense then
OpenStudy (unklerhaukus):
we are very close to one of those
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OpenStudy (unklerhaukus):
what is the square root of five squared?
OpenStudy (anonymous):
5? I think
OpenStudy (anonymous):
oh wait i did that wrong
OpenStudy (unklerhaukus):
yes, so
what is our final answer?
OpenStudy (anonymous):
5 squared over
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OpenStudy (anonymous):
3 I wanna say