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"lim"(x->0)(ln(t a n(pi/4+a x)))/(sinb x...

`"lim"_(x->0)(ln(t a n(pi/4+a x)))/(sinb x),b!=0` is equal to
(a)`a/b`
(b) `(2a)/b`
(c) `a/(2b)`
(d) `b/a`

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