exam Maths Puzzle Numerical Ability

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Should the triangle be solved beginning with Laws of sines or Laws of Cosines. Then solve the triangle and round to the nearest tenth. A=56 degrees, B=38 degrees, a=13.

Thank You I need help with the following question. The problem needs to be solved using subsitution. The answer that I got does not agree with the answer in the book.

y=x^2
x^2+y^2=1