self Maths Puzzle

If a+ (1)/a+2 =0, then value of (a+2)^3 +(1)/(a+2)^3 is

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self Other Question

What is the next number in this series?
4, 6, 12, 18, 30, 42, 60, 72, 102, 108,?
If alpha is a positive acute angle and 2sin alpha+15cos^2alpha=7,then the value of cot alpha is