Trigonometryhard · Past Paper
If tan A + tan B = a and cot A + cot B = b, then cot(A+B) is:
A1/a - 1/b
B1/b - 1/a
Ca + b
Da - b
✓ Correct Answer: B — 1/b - 1/a
Using cot definitions and simplifying cot(A+B) leads to the relation 1/b - 1/a.
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