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  1. The value of
    cot 30° - cot 75°
    		 is :
    tan 15° - tan 60°
    1. 0
    2. 1
    3. √3 -1
    4. - 1
Correct Option: D

cot 30° = cot (90° – 60°) = tan 60°
cot 75° = cot (90° – 15°) = tan 15°

∴
cot 30° - cot 75°
tan 15° - tan 60°

∴
tan 60° - tan 15°
= - 1
tan 15° - tan 60°


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