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babydoll332
Group Title
Evaluate sec 240° without using a calculator by using ratios in a reference triangle.
 2 years ago
 2 years ago
babydoll332 Group Title
Evaluate sec 240° without using a calculator by using ratios in a reference triangle.
 2 years ago
 2 years ago

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butterflyprincess Group TitleBest ResponseYou've already chosen the best response.0
unit circle??
 2 years ago

babydoll332 Group TitleBest ResponseYou've already chosen the best response.0
with outt it
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
ok, u know what is cos 60 ?
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
cos pi/3 = ?
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
lol! 60=pi/3 cos 60 = 0.5 ok ?
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
sec 240 = 1/ cos 240 cos 240 = cos (180+60) cos (180+x) = cos x now try
 2 years ago

babydoll332 Group TitleBest ResponseYou've already chosen the best response.0
what should i try im a lilttle confused
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
cos (180+x) = cos x so cos 240 = cos 60 = 0.5 got this ?
 2 years ago

babydoll332 Group TitleBest ResponseYou've already chosen the best response.0
i think so
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
now sec 240 =1/ cos 240 = 1/(0.5) = 2 ok ?
 2 years ago

babydoll332 Group TitleBest ResponseYou've already chosen the best response.0
why did u use cos 60 though?
 2 years ago

ByteMe Group TitleBest ResponseYou've already chosen the best response.0
60 degrees is the reference angle for 240 degrees
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
because cos 60 is known 60 is standard angle in unit circle
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
any more doubts ?
 2 years ago
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