Trigonometrymedium · Past Paper
Which of the following is equivalent to cot(A - B)?
A(cot A cot B + 1) / (cot B - cot A)
B(cot A cot B - 1) / (cot B + cot A)
C(cot A + cot B) / (1 - cot A cot B)
Dcot A - cot B
✓ Correct Answer: A — (cot A cot B + 1) / (cot B - cot A)
This is the standard expansion for the cotangent of the difference of two angles.
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