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Mathematics 14 Online
OpenStudy (abmon98):

Trigonometry Question

OpenStudy (anonymous):

What's the question?

OpenStudy (abmon98):

\[\tan \Theta+\cot \theta/\sec \Theta+\csc \theta \]

OpenStudy (abmon98):

Prove identity to be equal to 1/sin(theta)+cos(theta)

OpenStudy (anonymous):

Ask yourself what tangent is. Then perform the same identification process for cotangent, secant, and cosecant. The answer will make itself clear.

OpenStudy (anonymous):

the two sides are not equal.

OpenStudy (abmon98):

\[\tan \theta=\sin \theta/\cos \theta, \cot =1/\tan \theta= \cos \theta /\sin \theta\]

OpenStudy (anonymous):

Let's call theda x. It will be easier for to type.

OpenStudy (anonymous):

tanx = sinx / cosx Right?

OpenStudy (abmon98):

\[\sec \theta=1/\cos \theta, \csc =1/\sin \theta \]

OpenStudy (anonymous):

Exactly. What about cot?

OpenStudy (abmon98):

okay let it be x

OpenStudy (abmon98):

let theta be x sinx/cosx+cosx/sinx/1/cos+1/sinx cosines and sines at the numerator are cancelled out

OpenStudy (abmon98):

perform a cross multiplication 1/sinx+cosx/sinxcosx

OpenStudy (anonymous):

You skipped some steps, but I think you got the idea.

OpenStudy (abmon98):

@lordsampigans How can i get rid of sinxcosx then?

OpenStudy (anonymous):

Let me put it this way.... Gimme a second.

OpenStudy (anonymous):

So let's look at this as a giant algebra problem with some crazy fractions.

OpenStudy (anonymous):

Let's start by asking you a very fundamental question. Sin^2(x) + Cos^2(x) = ?

OpenStudy (abmon98):

1

OpenStudy (anonymous):

Absolutely. You are now prepared to solve this guy.

OpenStudy (anonymous):

So looking at the problem. We have tan(x) + cot(x) all over sec(x) + csc(x)

OpenStudy (abmon98):

i got it

OpenStudy (anonymous):

Rewrite this. This is confusing to look at. Let's write it as tan(x) + cot(x) / (sec(x) +csc(x) Literally write your division symbol like you did in grade school.

OpenStudy (abmon98):

now thank you

OpenStudy (abmon98):

you gave me the hint to solve the problem

OpenStudy (anonymous):

Lol. Glad I could help.

OpenStudy (abmon98):

Thank you man :)

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