exam Maths Puzzle Numerical Ability

Your parents want to start a college fund for you. they plan to deposit money in an account that pays 2% annual interest compounded monthly. how much should they deposit so that th

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A farmer wants to fence off a small rectangular enclosure of 1000metre squared in a field. He has 90 m of fencing and will use one of his existing boundary walls for one of the lon Please help me with this problem.
Find an expression that completes the identity.
(2sin^2(x)+cos2(x))/(sec(x)) = ??