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# Trig Proof watch

1. https://imgur.com/a/VuCih

I'm doing Further Maths on the first year of the new spec from Edexcel so I think this is probably C4 from the old one? Either way I've been given this 8 mark proof and have no idea where to start! It follows on from a chapter with all the addition and double angle formulae.
2. Where did u find this
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3. (Original post by timif2)
Where did u find this
Teacher gave it to me on a review sheet

4. I just did it u don’t need any addition formulae or anything but I did it in radians if you’ve come across that yet?
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5. (Original post by timif2)

I just did it u don’t need any addition formulae or anything but I did it in radians if you’ve come across that yet?
I have - thank you! I’m sorry to ask but would you mind uploading a clearer photo?
6. Split the logo into upper and lower hemisphere.

Find the area of the upper circle sector and subtract the area of the triangles (find the lengths of the dimensions using Pythagoras and trigonometry)

Multiply it by 2 cos there are two shaded areas (top bottom)
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