Trigonometryhard · Past Paper

Find value of cot 7.5°.

A√6 + √3 + √2 + 2
B√6 - √3 + √2 - 2
C√6 + √2 + √3 + 1
D√2 + √3 + √4 + √6

✓ Correct Answer: A — √6 + √3 + √2 + 2

cot(θ/2) = (1 + cos θ) / sin θ. Using θ=15°, this results in √6 + √3 + √2 + 2.

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