# Difficult Trigonometry (3 Problems)

#### TrinityHarvin

I'm needing some help figuring out how to begin working these problems. I don't very much understand this section of Trigonometry.
(You can click the pictures to see them full size.)

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#### Plato

MHF Helper
I'm needing a walk-through with these problems.
(You can click the pictures to see them full size.)
View attachment 39312View attachment 39313View attachment 39311
It is not the function of this HELP-SITE to offer a walk-through.
You have shown any effort on your part. You may need a private tutor. If that is the case, then you need to look else where.
You post work and we help you understand
The first set of questions are simple half-angle questions.
Show some effort.

1 person

#### TrinityHarvin

Well, I will rephrase my question. Thank you for helping me with the half-angles part.
I have no one to tutor me.
Sorry for the intrusion.

#### topsquark

Forum Staff
I'm needing some help figuring out how to begin working these problems. I don't very much understand this section of Trigonometry.
(You can click the pictures to see them full size.)

View attachment 39312
In the future, please post only one question per thread. It just gets messy this way.

For the first attachment maybe it would help for you to tell us what the half-angle formulas are for tangent and cosine?

-Dan

#### TrinityHarvin

Yes. I'd appreciate that, please.

#### joshuaa

for question 16 - (a)

here is the half angle formula for tangent

or

you can use either one, then

Just leave the answer like this since the question mentioned that no need to simplify.

for (b) use half angle formula for cosine and follow same style
(c) is similar to (a) just modify the angle

1 person

#### joshuaa

question 17 - (a)

question 17 - (b)

#### joshuaa

question 15 - (a), I leave the reason part for you

question 15 - (b)