a∈(0,π/9),求f(a)=1+sina+cosa/sinacosa+sina+cosa的值域
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a∈(0,π/9),求f(a)=1+sina+cosa/sinacosa+sina+cosa的值域
a∈(0,π/9),求f(a)=1+sina+cosa/sinacosa+sina+cosa的值域
a∈(0,π/9),求f(a)=1+sina+cosa/sinacosa+sina+cosa的值域
题目很有问题啊