>>641
x≒0.808 解析的には解けない
http://www.wolframalpha.com/input/?i=plot+%28%28cos+x%29%282%28sin+x%29-3%29%29+%3D+%28%28%28sin+x%29%5E2-3%28sin+x%29-1%29%2B5%29+%2F+%28x-3%29+%2C+x+%3D+0+to+2+pi
http://www.wolframalpha.com/input/?i=plot+y%3D%28-1.074%29%28x-3%29-5%2C+x%3D%280.808%29%2C+y%3D%28sin+x%29%5E2-3%28sin+x%29-1%2C+x%3D0+to+2+pi