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B
43
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C
−2√3
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D
−43
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Solution
The correct option is A43 limh→02[√3sin(π6+h)−cos(π6+h)√3h(√3cosh−sinh)] =limh→02[√32sin(π6+h)−12cos(π6+h)√3h(√32cosh−12sinh)] =2limh→0[sin(π6+h−π6)√3hcos(h+π6)] =2limh→0sinh√3hcos(h+π6)=43