Why is it (2n-1)*pi/2. Can you please explain it to me. Thank you

Q: 00 n-

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Q: (-8)' + (-1)2 10. 020 1 (-6)" | 11. 92 - (-2)' 12.

A: 10.   (-8)1 + (-1)2 11.   020 / (-6)1 12.    92 - (-2)1

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Q: Can you go into more detail? Why is the answer (4n+1)pi/2?

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