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Mathematics 18 Online
OpenStudy (anonymous):

Find the exact value of tan inverse

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 : \(\theta\)

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?

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

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..?

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):

\[√x^2 = x\]

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

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

OpenStudy (anonymous):

3 I wanna say

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