A geometry problem by أحمد الحلاق
Geometry
Level
2
\[ \log (\tan 3^\circ) + \log(\tan 6^\circ) + \log(\tan 9^\circ) + \cdots + \log( \tan 87^\circ) = \, ? \]
Clarification: 3, 6, 9,... 87 follows an arithmetic progression.
by
أحمد الحلاق