anonymous
  • anonymous
I have another that's kickin my butt. cos(2t)=1/2
Mathematics
chestercat
  • chestercat
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amistre64
  • amistre64
when is cos(t) = 1/2 ??
anonymous
  • anonymous
yup and 0
amistre64
  • amistre64
do you know your basic trig angles and their values?

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anonymous
  • anonymous
tryin to get better at it
amistre64
  • amistre64
trig is like learning the multiplication tables; just need to get it memorized :)
amistre64
  • amistre64
the basic triangle for this is the 60-30-90; 60 has a cos of 1/2
anonymous
  • anonymous
cos(2t)=1/2 was the equation
amistre64
  • amistre64
60 is pi/3 radians; so the question is: 2t = 60 t = 30 and t = 360-30 t = pi/6 and t = 330 = 12pi/6-pi/6 = 11pi/6
amistre64
  • amistre64
if you know that cos(60) = 1/2 the 2t = 60 t = 30....

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