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OpenStudy (anonymous):
cos^2(x)+2cos(x)+1=0
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OpenStudy (anonymous):
lot cosx=a
OpenStudy (alekos):
this is just a quadratic equation with cosx as the variable
OpenStudy (anonymous):
solve the equation on the interval (0<x<2pi)
OpenStudy (alekos):
do you know how to solve a^2 + 2a +1 =0 ?
OpenStudy (anonymous):
yes thank you i got it
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OpenStudy (alekos):
OK good. your welcome
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