Let f(x)= cos3 – 1.25cos2x + 0.225. Determine f ̍ (xo) at the point xo at (π/2,...

Let f(x)= cos³ – 1.25cos²x + 0.225. Determine f ̍ (x_o) at the point x_oat (π/2, π) where f(x_o)=0

Step by step procedure to understand the exercise please.
The solution of the book is not acceptable, since they do not explain where the result comes from.

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milcah answered 1 year ago

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