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so i plug the value for y into one of the equations?

but its \[2\cos ^{2}2\theta=-1+3\cos 2\theta\]

n dik wat 2 do w/the 2 in front of the theta

so if i use the quadratic formula then i shud b able to solve for y?

is y \[(-3\pm sort{17})/4\]

n y stands for cos2theta?

yes... y=cos2theta...

so its 30

n 0

you have several answers between [0, 2pi)

so 30 150 210 n 330?

or just is it just 30 n 330 since we are dealing with cos?

i only see 30, 330, 0 degrees

thank u!!!!!!! u helped so much.....by any chance cud u help me solve this next one?
6tanθ−6cotθ=0

yw...
post it up as a new question...

okie dokie :)