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Question

Find the value of following function;

cos1(cos13π6)

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Solution

cos1(cos13π6)=cos1[cos(2π+π6)];whereπ6ϵ[0,π]

[Hence, the] given angle does not lie in the principal interval i.e., [0π], so we convert it such that it lies in [0π].]
cos1[cos(π6)]=π6

[ cos(2π+θ)=cosθ]


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