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satellite73 Group TitleBest ResponseYou've already chosen the best response.0
you are looking for the number between 0 and \(\pi\) whose cosine is \(\frac{1}{2}\)
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.0
if you still have that cheat sheet, look at the place on the upper half of the unit circle where the second coordinate is \(\frac{1}{2}\)
 2 years ago

Aperogalics Group TitleBest ResponseYou've already chosen the best response.0
π/3 simple
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.0
ok here is the picture dw:1351127015253:dw
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.0
in this picture, \(\theta=\arctan(2)\) an angle whose tangent is 2 since tangent is "opposite over adjacent" i labelled the opposite side 2 and the adjacent side 1
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.0
the hypotenuse we find by pythagoras, it is \(\sqrt{1^2+2^2}=\sqrt{1+4}=\sqrt{5}\)
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.0
and using sine as "opposite over hypotenuse" we see that the sine of the angle is \[\frac{2}{\sqrt{5}}\]
 2 years ago
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