Is taking pictures of eiffel tower illegal?

The use of BaSO_4 in taking X-ray pictures of digestive tract is based on

A man can take pictures of those objects which are not fully visible to the eye using camera films acceptable to

The angle of elevation of the top of a tower at a point A due south of the tower is alpha and at beta due east of the tower is beta . If AB=d, then height of the tower is

_______ expansion makes the Eiffel Tower taller during summers.