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  1. If A = tan 11° tan 29°, B = 2 cot 61° cot 79°, then :
    1. A = 2B
    2. A = – 2B
    3. 2A = B
    4. 2A = – B
Correct Option: C

A = tan11° . tan 29°
B = 2 cot 61° . cot 79°
= 2 cot (90° – 29°) cot (90° – 11°)
= 2 tan 29° . tan 11°
[∵ cot (90° – θ) = tan θ]
= 2 A


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