We have to find the number of values of x satisfying
$\rm arccos x + \rm arccot2x=-\frac{\pi}{2}$
According to me it should be zero as both range of arccos and arcot is always positive .
But the answer given as $2$.
number of values of $x$ in inverse trigonometric function
2
$\begingroup$
trigonometry
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0What is the source of the problem? – 2017-02-19
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0@labbhattacharjee a institute book – 2017-02-19
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0Is there a typo error – 2017-02-19
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0Either the answer is a typo or the question has one. So, definitely a typo. – 2017-02-19