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Hello!
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❖ You can write 0.8 as 8/10 and 80% as 80/100.
(8/10 and 8/100 are equivalent.)
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What are the units? Tell me the units so I can solve this please.
Answer: 7/8
Cos2x has 3 formulas, Sinx is given in the question, we should use the formula with sinus. I guess that's the solution.