Write the expression as either the sine, cosine, or tangent of a single angle.. sin 52° cos 13° - cos 52° sin 13°

We are given with the expression  sin 52° cos 13° - cos 52° sin 13° The expression can be patterned from the trigonometric identity sin (a - b) = sin a cos B - cos A sin B. In this case, the expression is equal to sin (52-13)  or equal to a simplified term sin 39

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