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Question

limh023sin(π6+h)cos(π6+h)3h(3coshsinh)=

A
23
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B
43
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C
23
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D
43
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Solution

The correct option is A 43
limh02[3sin(π6+h)cos(π6+h)3h(3coshsinh)]
=limh02[32sin(π6+h)12cos(π6+h)3h(32cosh12sinh)]
=2limh0[sin(π6+hπ6)3hcos(h+π6)]
=2limh0sinh3hcos(h+π6)=43

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