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Show that sin2A is equal to 2sinAcosA

This question requires you to use the trigonometric identity sin(A+B)=sinAcosB + sinBcosA. The difficulty in this problem is noticing that you need to substitute 2A for A+A and then you can simply put this i...
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Answered by Samuel L. • Maths tutor
39061 Views

What are the distinctive characteristics of a perfectly competitive market?

Many sellers in the market - each of whom produce a low percentage of market output and cannot influence the prevailing market price – each firm in this market is a price taker - i.e. it has to take the mark...
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Answered by Nicolo G. • Economics tutor
3577 Views

What is the perfect technique for reaching the top marks in the longer essay questions?

The key for a good 30 marker is sticking to the same tried and tested method. Start off by defining any key terms in your introduction and potentially referencing data you may have been given. Then in the he...
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Answered by Louis G. • Economics tutor
2731 Views

Explain enzyme-substrate specificity

Enzymes and substrates share specificity in that an enzyme will only react with a specific substrate • This is because the active site is complementary in both shape and charge to a given substrate • The mod...
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Answered by Zoe G. • Biology tutor
10893 Views

1. What is a floating exchange rate system and what factors influence the level of a country’s exchange rate?

A floating exchange rate is when the price of money is determined only by demand and supply, no government intervention occurs. The factors, which influence the level of a country’s exchange rate are the dem...
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Answered by Zoe G. • Economics tutor
6406 Views