FInd the value of sin[2cot^(- 1)(- 5/12)]
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Let cot–1 (–5/12) = y. Then cot y = -5/12
sin 2 cot-1 5/12 =2y
=2siny cosy
=2 12/13 -5/13 [since cot y<0 , so ye {x/2,x}]
= -120/169
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