exam Maths Puzzle Numerical Ability

A.) Arctan(tan 315 degrees)

B.)Arctan (tan 150 degrees)

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exam Other Question

need to formulate a conjecture for the series

L = 1^k + 2^k + 3^k +...+ n^k

^ = to the power of

thanks.
please help solve

Divide and express the result in standard form

6 -5i / 8 + 4i