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h²=x²+y²⇒ x²=h²-y²∴ x²= 41²- 40²= 1681-1600= 81
x²=81⇒ x=√81 ∴ x= 9, ahora calculamos E:
E= cscФ + cotФ
E= 41/40 + 9/40
E= 50/40
E= 5/4