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Using complex numbers, derive the trigonometric identities for cos(2θ) and sin(2θ).

When dealing with complex numbers and trigonometric functions, always turn to DeMoivre's Theorem that states [cos(θ)+isin(θ)]n = [cos(nθ)+isin(nθ)]. If we set n=2, the we see a combina...

TK
Answered by Thomas K. Maths tutor
8954 Views

Integrate (x+3)^(1/2) .dx

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Here we need to make a U sibstitution. So we take (x+3) and make this equal U so we now have the integral of u^1/2   . dx

In order to s...

CZ
Answered by Callum Z. Maths tutor
4709 Views

How do you form the pluperfect tense?

  • The pluperfect, much like the passé composé, is a compound tense (i.e. made up of two parts). The first is the auxiliary verb (avoir or être) and the second is the past participle. For this example,...
DF
Answered by Darcy F. French tutor
3369 Views

‘Henry VII’s financial policies were the most important reason for the success of his rule.’ Assess the validity of this view.

Henry VII is credited with a successful rule due to the way in which England was able to develop; from a financially ruined, isolated, politically divided country after the War of the Roses, to a financia...

MM
Answered by Megan M. History tutor
40288 Views

How does Charles Dicken’s use language to present the harm of industrialization through description of Coketown in ‘Hard Times’?

Coketown is a fictional industrial city in Charles Dicken’s novel, Hard Times. He wrote it as a protest against industrialization, which he considered harmful to nature and to the human spirit an...

MP
18117 Views

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