exam Maths Puzzle Numerical Ability

2xy-4xt3y-6

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Olivia, Newt, and John were each born 3 years apart, with Olivia the youngest and john the oldest. The sum of the squares of their ages is 606. How old is each? HI, I'm in year 10 and I see the relevance and usefulness of trigonometry, but there has to be a simpler way to do some of these things!
How can you work out sine, cosine, tangent