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Use a half-angle identity to find the exact value of cos 15

Use a half-angle identity to find the exact value of cos 15
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Use a half-angle identity to find the exact value of cos 15

Use a half-angle identity to find the exact value of cos 15-example-1
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User Neoascetic
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Answer:

It's too short. Write at least 20 characters to explain it well.

Use a half-angle identity to find the exact value of cos 15-example-1
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User Shezad
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