Question: - Let = arccos(-), then 1 72 O= and cos 4 3 0 0 2 and cos 0=- - 4 O0=4 and cos 0=-

- Let = arccos(-), then 1 72 O= and cos 4 3

- Let = arccos(-), then 1 72 O= and cos 4 3 0 0 2 and cos 0=- - 4 O0=4 and cos 0=- - - 1 2 1 O 0=-2 and cos 0=-

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