When do I use sin(A±B) = sinA cosB ± cosA sinB in Trigonometry, and what does it mean?
the sine addition formula.
sin(A±B) = sinA cosB ± cosA sinB — the sine addition formula. Use it when: compound angles. Always check the condition holds before plugging in numbers.
Key point
sin(A±B) = sinA cosB ± cosA sinB
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