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berrypicking
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solve equation in the interval from 0 to 2pi.
7 cos 2t =3
 one year ago
 one year ago
berrypicking Group Title
solve equation in the interval from 0 to 2pi. 7 cos 2t =3
 one year ago
 one year ago

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berrypicking Group TitleBest ResponseYou've already chosen the best response.0
corrections 7 cos 2t=3
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
arccos 3/7  your calculator will give u the value of t in first quadrant the other value is in 4th quadrant
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
what does arccos mean
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
am I setting calculator in rad. or degrees
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
oh  then find angle whose cos is 3/7 0 calculator will give you value of 2t in first quadrant
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
right  set to rad arccos means the angle whose cos is given value or  on calculator button this might be cos 1
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
cos 3/7= .91 now what
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
how do I get the other value
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
you need cos1 not cos check again : i make it 1.128 rad
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
ok that is 1.099??
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
1/cos(3/7) right?
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
and how do you know I need cos1 and not cos?
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
no  the cosine of the angle 2t = 3/7 you need to find the angle whose cosine is 3/7 first find 3 / 7 on ur calculator then you need to press the cos1 (or arccos) button
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
do I just press cos then 1
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
cos1 does not mean 1 / cos in this context
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
no there is probably a button marked cos but you first press the shift key then cos button to get value of the angle
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
cos1 notation is a bit confusing  in Europe they use arccos which makes more sense
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
cos (3/7)=.91. Do I press shift key before entering cos (3/7)? don't know the shift key
 one year ago

berrypicking Group TitleBest ResponseYou've already chosen the best response.0
I haven't done any problems with cos1
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
calculators vary you either press shift cos (3/7) or (3/7) shift cos
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
the correct value is 1.127 (to 3 dec places)
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
sorry 1.128
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
its a bit hard to explain without seeing your calculator....
 one year ago
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