Prove that: sinA . secA = tanA
(​please help)

A. roman art matured during the hellenistic era in which the refinement and restraint seen in greek art had given way to dynamic poses and strong emotions. b. the romans believed in showing idealized portrayals of the human body as characterized by the elegance seen in the statue venus de milo. c. the romans always portrayed their emperors as powerful, absolute rulers as seen in the colossal head of constantine.