cierrawilson8338 cierrawilson8338

29-01-2024
Mathematics

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Normally I just look up or remember that cos(π/4)=2√2cos⁡(π/4)=22, or type "cos(π/4)cos⁡(π/4)" into WolframAlpha to check the answer.
But what about the first time someone wanted to know what cos(π/4)cos⁡(π/4) was? How could they find out before trig tables and WolframAlpha?
How can you prove that cos(π/4)=2√2cos⁡(π/4)=22?

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