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forum.virtualchallengemeets.com • View topic - trig problem

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trig problem

What could be so hard. It's a multiple-choice test for Pete's sake.
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trig problem

Postby smeag » Mon Feb 20, 2012 7:36 pm

solve: 4cos^2x - 1 = 0

no intervals! please show your steps...
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Re: trig problem

Postby AuSmith » Mon Feb 20, 2012 8:54 pm

What do you mean by "no intervals"?
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Re: trig problem

Postby nsguy1350 » Mon Feb 20, 2012 9:03 pm

I think I understand what you mean.
Anyways, [unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
I hope that notation is right.
pi/3 or -pi/3, plus or minus 2n x pi, where n is an integer.
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Re: trig problem

Postby Capybara » Mon Feb 20, 2012 10:29 pm

or cosx = -1/2, which gives x = 2pi/3+2kpi or 4pi/3+2kpi
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Re: trig problem

Postby nsguy1350 » Mon Feb 20, 2012 10:55 pm

Thanks, how did I not catch that?
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