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08-11-2020
Mathematics

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How do you do this question?

How do you do this question class=

Respuesta :

MathPhys MathPhys

08-11-2020

Answer:

½√2

Step-by-step explanation:

∑ₙ₌₀°° (-1)ⁿ π²ⁿ / (4²ⁿ (2n)!)

∑ₙ₌₀°° (-1)ⁿ (π/4)²ⁿ / (2n)!

Using the Taylor expansion for cos x:

cos (π/4)

½√2

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