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  3. 12. if cos(?)+sin(?)=(1+?3)/2 and cos(?)-sin(?)=(1

12. If cos(?)+sin(?)=(1+?3)/2 and cos(?)-sin(?)=(1-?3)/2 find the value of sin(2?).

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12. If cos(?)+sin(?)=(1+?3)/2 and cos(?)-sin(?)=(1-?3)/2 find the value of sin(2?).

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