exam Maths Puzzle Numerical Ability

Can you please help me with this problem? 25x^2-4/49 factor out completely or state that it is prime.

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exam Other Question

Can you answer this problem for me? It is so long, and I just keep getting stuck. It has to do with the trigonometric identities. The instructions are to verify the identity. Here two-thirds of the diameter of a cirlce that is 9/16 across and 9/16?