At the outer level is an application of the squaring function (power, with the second argument the number 2), and the first argument to power, is an application of the sin function.
最外层是平方函数的应用(power，第二个参数是数字2)，power的第一个参数是sin函数的应用。
In the second we give the necessary and sufficient conditions for strict convexity of power function of exponential family in the discrete case.
在第二个问题中，我们给出了在离散的情形下，指数族势函数严凸的充分必要条件。
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