exam Maths Puzzle Numerical Ability

I do not understand the steps to solve the proofs
I understand how to get the "Given" and the "Prove" not the steps in between
could you please do step by step on how to get the

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exam Other Question
given triangle ABC with a=10 A=13 and B=26 what is the lenght of c?
i hope you can help
thanks a bunch! ((x^2-y^2)/2x)/((x+y)/x^2)