Question
$\tan A + \cot (180^\circ + A) + \cot (90^\circ + A) + \cot (360^\circ - A)$
$ = \tan A + \cot A - \tan A - \cot A = 0$.
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$3(\sin 3 \theta) x-y+z=2$
$3(\cos 2 \theta) x+4 y+3 z=3$
$6 x+7 y+7 z=9$
का कोई हल नहीं है, की संख्या है: