- #1

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## Homework Statement

I got everything in the answer, just that my answer was 2∫ d∅ was from [0 to ∏]. Same answer, but different approach.

## The Attempt at a Solution

How can the angle between 2 planes be greater than ∏? I took 2∫ d∅ from [0 to ∏] because I considered 2 cases, where y > 0, and y < 0...