Question
Find the approximate values of:
$\cos \left(60^{\circ} 30^{\prime}\right)$, given that $1^{\circ}=0.0175^{\circ}, \sqrt{ } 3=1.732$
$\cos \left(60^{\circ} 30^{\prime}\right)$, given that $1^{\circ}=0.0175^{\circ}, \sqrt{ } 3=1.732$
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$\tan ^{-1} x+\cot ^{-1} x=\frac{\pi}{2}$