Question

sin 11 градусов 15 минут * cos 11 градусов 15 минут * cos 22 градусa 30 минут * cos 45 градусов

Answer 1

$2sinalphacosalpha=sinalpha$

 

$sin11^circ15'cdotcos11^circ15'cdotcos22^circ30'cdotcos45^circ = \ =frac12sin22^circ30'cdotcos22^circ30'cdotcos45^circ=frac14sin 45^circcos45^circ=\=frac18sin90^circ=frac18cdot1=frac18$