im doing this blog on chapter 10 section 1. this chapter took me a little while to get but now i know how to do it and it is easy. it is really simple. you have to know the formulas and you have to know the trig chart. everything from chapter 7 and on you better know or you will be beat down by b-rob with her tests.
formulas:
cos(alpha +/- beta) cos alpha cos beta -/+ sin alpha sin beta
sin(alpha +/- beta) sin alpha cos beta +/- cos alspha sin beta
aplha and beta come from the trig chart and add or subtract to get the angle you are looking for
examples:
1)
cos(75)
alpha 45
cos 30
sin(45+30)= sin45 cos30- cos45 sin30
=square root of2/2 (square root of 2/2)- square root of 2/2(1/2)
square root of6/4- square root of 2/4
= square root of 6-2 all over 4 (final answer)
this is what i learned from chapter 10 section 1. hope this helps some people
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