How to solve the third question of Zhejiang college entrance examination liberal arts mathematics volume 5.9. 16

5.acosA=bsinB sinAcosA=sinB squared sinB squared plus cosB squared equals 1.

9. If there is a common focus c= root number 5, draw an equation.

16. The basic inequality transforms the relationship between the sum of squares of x and y into the root number XY, which can be substituted into the equation to solve x+y. 。

Well, it's a little abstract. I wonder if I can understand.

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