y^21-56y 6=cosπ/56得216x21-656a 21212...1

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y^21-56y6=cosπ/56得216x21-656a21212...1y^21-56y6=cosπ/56得216x21-656a21212...1y^21-56y6=cosπ/56得216x21

y^21-56y 6=cosπ/56得216x21-656a 21212...1
y^21-56y 6=cosπ/56得216x21-656a 21212...1

y^21-56y 6=cosπ/56得216x21-656a 21212...1
|√18-√x 4^18|或y=-√431/6x