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Can you prove to me why cos^2(X) + sin^2(X) = 1?

The answer to this lies in the geometry of a circle. At GCSE you were taught that a circle has a radius (which I will call R ) which is the distance from the centre to a point on the circle. We put the centr...
JM
Answered by Jack M. • Maths tutor
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Examine the view that “‘A Streetcar Named Desire’ is not only the story of a desperate woman, but of a culture in the state of crisis”.

Indeed, Blanche DuBois is a woman in desperation. The initial monologue, ‘I, I, I took the blows’ conveys a gritty, realistic tone as Blanche has witnessed the death of those around her and now has nowhere e...
TD
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Glucose is filtered out of the blood, but is not found in urine. Explain why glucose is not present in urine

Glucose is filtered out of the blood in the glomerulus of the kidneys. All of the glucose is then is actively transported back into the capillaries in the area of the nephron called the proximal convoluted t...
AC
Answered by Alex C. • Biology tutor
17535 Views

What is the oxidation number of Mn in K2MnO4?

The oxidation number of an ion is the same as its charge. We know that the oxidation number of K+ is +1 and the oxidation number of O2- is -2, but we don't know the oxidation number of Mn so let's call that ...
AC
Answered by Alex C. • Chemistry tutor
54430 Views

How do I answer a 10-mark exam question? (A Level Music)

Once you've got a good grasp on your material, it's really useful to spend a bit of time thinking about the most efficient ways you could organise it. For example, if you are asked 'how is this piece a typic...
CM
Answered by Claire M. • Music tutor
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