Trigonometrymedium · Past Paper
The value of cot 10 * cot 80 is:
A0
B1
C-1
D2
✓ Correct Answer: B — 1
cot 80 = tan(90-80) = tan 10. Since cot 10 * tan 10 = 1, the product is 1.
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✓ Correct Answer: B — 1
cot 80 = tan(90-80) = tan 10. Since cot 10 * tan 10 = 1, the product is 1.
Share this question