Which of these formulas is equal to, where?

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Which of these formulas is equal to<br><img src='https://www.fatskills.com/images2/GradExams/7ED44682-D4CA-471A-8FA1-DCC1053C9049.png' height='25' width='137'/>, where<br><img src='https://www.fatskills.com/images2/GradExams/8FAD952C-CDCB-4C22-9484-1059BB35D4D1.png' height='18' width='109'/>?