Show that the equation may be written as a quadratic equation in . Hence solve the equation, giving all values of "x" such that 0<=x<=360.
Follow Math Help Forum on Facebook and Google+
Originally Posted by Lonehwolf Show that the equation may be written as a quadratic equation in . Hence solve the equation, giving all values of "x" such that 0<=x<=360. Square both sides, and use the Pythagorean identity, Collect terms and solve.
Didn't help me, this is what I did: Was that actually going good and I simply didn't notice or did I get what you meant with square both sides wrong?
Originally Posted by Lonehwolf Didn't help me, this is what I did: Was that actually going good and I simply didn't notice or did I get what you meant with square both sides wrong? Why the red things ? and this gives your quadratic
Originally Posted by Lonehwolf Didn't help me, this is what I did: Was that actually going good and I simply didn't notice or did I get what you meant with square both sides wrong? I am not sure what you are doing in the above. How did squaring cosine produce Is the equation in the original post the correct equation? You should have There is your quadratic, now solve it. Originally Posted by Moo Why the red things ? Yes, Moo. Why the red things?
Ah shame on me wrong first question -.- it should be
Originally Posted by Lonehwolf Ah shame on me wrong first question -.- it should be Then replace with . This is far easier than the problem you originally posted!