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What is the modulus of 3+4i?

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Answered by Vincent C. • Further Mathematics tutor

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How do I solve a simultaneous equation with more unknowns than equations?

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Two planes have eqns r.(3i – 4j + 2k) = 5 and r = λ (2i + j + 5k) + μ(i – j – 2k), where λ and μ are scalar parameters. Find the acute angle between the planes, giving your answer to the nearest degree.

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Are we able to represent linear matrix transformations with complex numbers?

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Prove by induction that, for all integers n >=1 , ∑(from r=1 to n) r(2r−1)(3r−1)=(n/6)(n+1)(9n^2 -n−2). Assume that 9(k+1)^2 -(k+1)-2=9k^2 +17k+6

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