So, now that you have your wonderful trig-table (zij) you can write in the sines, cosines, and tangent values of the special angles +36 degrees, their supplements, and then tick mark all the other sine, cosine and tangent values that you could possibly find using the formulas that you have been given. Remember, that if you can find the sine of a new angle then you can surely use that to find one of yet another new angle. What you CAN find, you can use.
When doing this exhaustive checking off of angles, think of what rational angles sines, cosines and tangents can be found for and what would be necessary in order to be able to find values for all angles.
Note: If you heard what Jack uttered today, then he has already clued you in to the second part of what I am asking you to consider.
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7 comments:
If you can find sin(1), then can't you find sin of all the angles using the sine addition/subtraction formula?
and if you know the sin of an angle, do you automatically know the cos and tan?
Julia, yes to your second question. I think that yes is also the answer to your first question as well. I believe this is what I overheard Jack saying before class. But...I don't know how to find one. Have you?
yes, I don't remember what exactly I did, but I think I found it. So, if we can find all of the angles, what are the exceptions?
I don't know...
I've found that I can only get things that are multiples of 3, so i'm not sure if we can actually find one... I could be wrong but thats what I found
Sam, I got found the same thing.
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