exam
Maths Puzzle
Numerical Ability
(n-1)(n)(n+1)=210
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exam Other Question
Verify the identity.
(cos(x) - cos(y))/(sin(x) + sin(y)) + (sin(x) - sin(y))/(cos(x) + cos(y)) = 0
t^2-8t-9 over t^2+5+4
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