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How do I differentiate a trigonometric function for something that is not just a single variable (e.g. d/dx (sin(3x))?

In order to differentiate a trig function with a term in front of the variable you are differentiating, you must use the chain rule. For example d/dx (sin (3x)) becomes 3cos(3x) because you have to multiply ...
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Answered by Kieran T. • Maths tutor
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Discuss pricing and non-pricing strategies

There are a number of pricing and non pricing a firm may use in order to seize market share, increase its total revenue and hence profits. Some pricing methods involve, a reduction in prices, predatory prici...
AP
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What is De Moivre's theorem?

De Moivres theorem states that e^j(theta) = cos (theta) +jsin (theta) and this can be used to convert powered trig functions to the form of regular sines and cosines (i.e. sin^3(x) into a sum of terms includ...
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Answered by Kieran T. • Maths tutor
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What is a moment?

A moment about a point is the product of a force applied and the distance perpendicular to the line of action of that force. So M = F*d
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Answered by Kieran T. • Physics tutor
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How and when should I include a historians' opinion?

You should include a historians' opinion to support or contrast the argument you have made. For example, say you were arguing for a certain time period that agrarian issues led to public discontent, and thus...
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Answered by Caitlin C. • History tutor
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