exam Maths Puzzle Numerical Ability

Verify the identity.

(cos(x) - cos(y))/(sin(x) + sin(y)) + (sin(x) - sin(y))/(cos(x) + cos(y)) = 0

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exam Other Question

the problem is this: 9x + 4y
-6x - 5y
(n-1)(n)(n+1)=210