A + B + C = 180^0 . Find the value of cos 2A + cos 2B + cos 2C
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![SOLVED: 7. (a) Explain what is meant by a machine? [2 marks] (b) A screw jack whose pitch is 4.4mm is used [0 raise a body of mass, S0(Okg through a height](https://cdn.numerade.com/ask_images/f9522ef2ad5f477ea6248cf3188f326f.jpg "SOLVED: 7. (a) Explain what is meant by a machine? [2 marks] (b) A screw jack whose pitch is 4.4mm is used [0 raise a body of mass, S0(Okg through a height")
SOLVED: 7. (a) Explain what is meant by a machine? [2 marks] (b) A screw jack whose pitch is 4.4mm is used [0 raise a body of mass, S0(Okg through a height
A + B + C = 180^0 . Find the value of cos 2A + cos 2B + cos 2C
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