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Attached as an image. Comments: If you find yourself doing long drawn out trig algebra, you might get to the answer, but you're going the wrong way. The geometrical interpretation of the answer is particularly interesting (well, to me anyway).

Hi, I enter the forum with some trepidation as I'm neither an Australian nor even a student - so forgive me barging in here. I'm teaching A-level Maths in China (A-level is the British exam in case you don't know). We have a lot of very talented and able students here. We've been trying to find...