anonymous
  • anonymous
thanks
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Loser66
  • Loser66
sin^2 = 1- cos ^2 ok? replace and let the terms all in left hand side , the right hand side =0. Show me that step, please
Loser66
  • Loser66
Do you know how to solve quadratic ?
anonymous
  • anonymous
no.....

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Loser66
  • Loser66
But we have no way to find out the solution without quadratic. How can I help??
anonymous
  • anonymous
a =pi
Loser66
  • Loser66
@cutegirl I shouldn't give you a free answer because it doesn't help you on long run.
anonymous
  • anonymous
got it
Loser66
  • Loser66
3cos a +3 = 1 - cos^2 a cos^2a +3cosa +2=0 (cos a+2) (cos a +1) =0 cos a +2 never =0 , because it is out of range hence , just cos a +1 =0 , then cos a =-1, hence a = pi + 2kpi.
Loser66
  • Loser66
yup. if limit is given, like from 0 to 2pi, then the answer is a =pi if you don't have any limit, then a = pi +2kpi
anonymous
  • anonymous
thanks so much !!!!
Loser66
  • Loser66
I don't know, you must look at your problem (the paper) , it is not up to me.
anonymous
  • anonymous
ow i c thanks

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