Doing these blog thingys is really getting old. but at least im remembering to do them now. This week was a tough week because it felt like all the classes were piling things on us and then we had two tests, free response at that. but at least we get points for just putting down a formula. i'm just gonna go over section 10-1 because that was the easiest one and i know i aced all of those on the testt!
formulas:
cos(alpha +/- beta) cos alpha cos beta -/+ sin alpha sin beta
sin(alpha +/- beta) sin alpha cos beta +/- cos alpha sin beta
alpha and beta come from the trig chart and add or subtract to get the angle you are looking for.
ex.1 find the exact value of sin 15
alpha= 45 beta=30 sin(45-30)
you plug those into your formula then you should get::
square root2/2 ( square root3/2)- square root2/2(1/2)
square root6/4- square root2/4
=square root6- square root2/ 4
sincerely, Tori Triche :)
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