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Let y=sin−1(sin8)−tan−1(tan10)+cos−1(cos12)−sec−1(sec9)+cot−1(cot6)−cosec–1(cosec 7). If y simplifies to aπ+b, then the value of a−b is

Answer» Let y=sin1(sin8)tan1(tan10)+cos1(cos12)sec1(sec9)+cot1(cot6)cosec1(cosec 7). If y simplifies to aπ+b, then the value of ab is


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