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To determine the value of tan- 7 1-cos 4 1. 7. sin 7 sin- 4 II. 7 1-cos 7 1-cos 4 III. 7 1+

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To determine the value of tan- 7 1-cos 4 1. 7. sin 7 sin- 4 II. 7 1-cos 7 1-cos 4 III. 7 1+ cos OI only OI and II only 7, which identity could be used?

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