已知函数f(x)=sinx sin^2(x/2)-con^2(x/2) a的最小值为根号2 ;(1)求a (2)求函数f(x)的单调增f(x)=sinx +sin^2(x/2)-con^2(x/2)+ a

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已知函数f(x)=sinx sin^2(x/2)-con^2(x/2) a的最小值为根号2 ;(1)求a (2)求函数f(x)的单调增
f(x)=sinx +sin^2(x/2)-con^2(x/2)+ a

sinx sin^2(x/2)
con^2(x/2) a
这之间的都是乘号?