What is ∑ r = 1 90 arctan ⁡ ( 2 r 2 + r...

Keenan Santos

Keenan Santos

Answered

2022-07-02

What is
r = 1 90 arctan ( 2 r 2 + r 2 + r 4 )

Answer & Explanation

Immanuel Glenn

Immanuel Glenn

Expert

2022-07-03Added 12 answers

Hint:
2 r 2 + r 2 + r 4 = ( r 2 + r + 1 ) ( r 2 r + 1 ) 1 + ( r 2 + r + 1 ) ( r 2 r + 1 )

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