Question 1200189
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arcsin(sin(10pi/3))+ arccos(cos(11pi/6))=
A) pi/2 B) pi/6 C) pi/3 D) pi/4
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The correct answer    {{{-pi/6}}}    is  NO  ONE  of the values of the answer list.


The problem is  DEFECTIVE:   it is posed incorrectly.



A ticket and the lowest possible mark to the person who created it.


This person,  obviously,  does not know the basics of the subject.



I am in doubt if this  " problems composer "  could pass an exam in  Math.