Табличные значения тригонометрических функций

$\sin \frac{\pi }{6} = \frac{1}{2}$	$\cos \frac{\pi }{6} = \frac{{\sqrt 3 }}{2}$	${\mathop{\rm tg}\nolimits} \frac{\pi }{6} = \frac{{\sqrt 3 }}{3}$	${\mathop{\rm ctg}\nolimits} \frac{\pi }{6} = \sqrt 3$
$\sin \frac{\pi }{4} = \frac{{\sqrt 2 }}{2}$	$\cos \frac{\pi }{4} = \frac{{\sqrt 2 }}{2}$	${\mathop{\rm tg}\nolimits} \frac{\pi }{4} = 1$	${\mathop{\rm ctg}\nolimits} \frac{\pi }{4} = 1$
$\sin \frac{\pi }{3} = \frac{{\sqrt 3 }}{2}$	$\cos \frac{\pi }{3} = \frac{1}{2}$	${\mathop{\rm tg}\nolimits} \frac{\pi }{3} = \sqrt 3$	${\mathop{\rm ctg}\nolimits} \frac{\pi }{3} = \frac{{\sqrt 3 }}{3}$
$\sin 0 = 0$	$\cos 0 = 1$	${\mathop{\rm tg}\nolimits} 0 = 0$	—
$\sin \frac{\pi }{2} = 1$	$\cos \frac{\pi }{2} = 0$	—	${\mathop{\rm ctg}\nolimits} \frac{\pi }{2} = 0$