Friday, November 3, 2017

trigonometry - How does one compute $cos((pi/4)(k-1 ))$?

How to compute $\cos \left( \frac{\pi}{4}(k-1) \right)$ ?

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analysis - Injection, making bijection

I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...