What is the exact value of sine of open paren 7 pi over 12 close paren ?

Rewrite 7π/12 as π/3 + π/4, or 60° + 45°. Using the sine addition formula, sin(60° + 45°) = sin 60° cos 45° + cos 60° sin 45° = (√6 + √2)/4. Therefore, the exact value is choice A.

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