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" 11."2cot^(-1)5+cot^(-1)7+2cot^(-1)8=(p...

" 11."2cot^(-1)5+cot^(-1)7+2cot^(-1)8=(pi)/(4)

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Prove that 2cot^(-1)5+ cot^(-1)7 + 2cot^(-1)8 =pi/4

2 cot ^(-1) 5+cot ^(-1) 7 + 2 cot ^(-1) 8=(pi)/(4)

cot ^(-1)""x+cot^(-1)""2x=(3pi)/(4)

cot^(-1)(cot((-46 pi)/(7)))

Prove that cot^(-1) 7 + 2 cot^(-1)3 = pi/4

Prove that cot^(-1)(13)+cot^(-1)(21)+cot^(-1)(-8)=pi .

Prove that cot^(-1)(13)+cot^(-1)(21)+cot^(-1)(-8)=pi .

cot((pi)/4-2cot^(-1)3)=

The sum of cot^(-1)(3/4)+cot^(-1)(7/4)+cot^(-1)(19/4)+ cot^(-1)(39/4)......oo