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Log f(x)=log((log)(1//3)((log)7(sinx+a))...

Log `f(x)=log((log)_(1//3)((log)_7(sinx+a)))` be defined for every real value of `x ,` then the possible value of `a` is 3 (b) 4 (c) 5 (d) 6

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`f(x)=log(log_(1/3)(log_7(sinx+a)))`
`log_(1/3)log_7(sinx+a))>0`
`0 `1<(sinx+a)<7`
`1-sinx `2
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