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If `(lim)_(x->-a)(x^9+a^9)/(x+a)9, `find the real value of `adot`A. `+-1`B. `+-3`C. `+-2`D. none of these

Answer» Correct Answer - A
We have, `lim_(x to pi//4)(x^9+a^9)/(x+a)=9`
`rArr lim_(x to -a)(x^9-(-a)^9)/(x-(-a))=9`
`rArr 9(-a)^(9-1)=9rArr 9a^8=9rArr a ^8=1 rArr a=+-1`


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