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  3. suppose ? is an angle such that cos(?)= -7/9if 0 &

Suppose ? is an angle such that cos(?)= -7/9If 0 < ?< ?,then cos (?/2)and...

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Suppose ? is an angle such that cos(?)= -7/9If 0 < ?< ?,then cos (?/2)and sin (?/2)If ?

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