Question
${\sec ^{ - 1}}[\sec ( - {30^o})] = $ ......... $^o$.
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$ A = \{ (x,\,y):y = \frac{1}{x},\,0 \ne x \in R\} $
$B = \{ (x,\,y):y = - x,\,\,x \in R\} $, तब