# Trig Equations

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• December 2nd 2007, 09:21 PM
CenturionMonkey
Trig Equations
How would you solve cos^2(x) = 1/4
please and thank you...
• December 2nd 2007, 09:25 PM
Jhevon
Quote:

Originally Posted by CenturionMonkey
How would you solve cos^2(x) = 1/4
please and thank you...

$\cos^2 x = \frac 14 \implies \cos x = \pm \frac 12$ now what values of x cause that to happen?
• December 2nd 2007, 10:21 PM
CenturionMonkey
how would you go about solving

tan2(x) = 8cos^2(x) - cot(x), domain is 0 to 360

please help...
• December 2nd 2007, 10:25 PM
Jhevon
Quote:

Originally Posted by CenturionMonkey
how would you go about solving

tan2(x) = 8cos^2(x) - cot(x), domain is 0 to 360

please help...

begin by changing everything to sines and cosines and see where you can go from there
• December 2nd 2007, 10:31 PM
CenturionMonkey
hey thanks, but actually i got it a different way, i was doing some simple multiplication wrong. lol. I hate how when you're doing something challenging you tend to undermine the simple stuff. heh.