exam Maths Puzzle Numerical Ability

how to prove that (1/2)(3/4)(5/6)(7/8)(9/10)*...(99/100)>=1/10

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exam Other Question

Please help me with this problem.
Find an expression that completes the identity.
(2sin^2(x)+cos2(x))/(sec(x)) = ?? Lake Superior is about 4 times the area of Lake Ontario.Lake Superior is 30,172mi^2.