



 
Hi Tony. First convert this to sine and cosine: Then multiply by cos(x): Now use the identity sin^{2 }(x) + cos^{2 }(x) = 1 to change it all to a single trig function: And this is just a quadratic in sin(x). So you can use the quadratic formula if you wish, or try to factor it. Can you finish the problem now?  


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