SOLUTION: I am having a really tough time understanding how this works. My teacher explained how this all breaks down, but I still do not understand how we arrive at the final part. Here

Question 1033745: I am having a really tough time understanding how this works.
My teacher explained how this all breaks down, but I still do not understand how we arrive at the final part.
Here are the examples I have:
when
=
=
=
I am having a hard time understanding how it became from the previous step.
AND
when
=
=
=
I am having a hard time understanding how it became from the previous step.
For both of these, I am looking at a Unit Circle, but I just don't see what I am missing.
Help/explanation would be greatly appreciated! Thank you!

Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
x is the value of a function, and t is the angle measure or variable input for the function. You are starting with .

You are interested in finding t if x=0. You find your way to a step,
.
At this stage, you must be acquainted with the meaning of cosine, and the common reference angles and the Unit Circle. No more mystery.

In fact, referring to the unit circle, OR .

Same basic concepts to do your second question.
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