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266t^(-1)5+cot^(-1)7+2cot^(-1)8=(pi)/(4)...

266t^(-1)5+cot^(-1)7+2cot^(-1)8=(pi)/(4)

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

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

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)

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

Prove that: tan^(-1)(1)/(7)+tan^(-1)(1)/(13)=tan^(-1)(2)/(9)tan^(-1)+tan^(-1)(1)/(5)+tan^(-1)(1)/(8)=(pi)/(4)tan^(-1)(3)/(4)+tan^(-1)(3)/(5)-tan^(-1)(8)/(19)=(pi)/(4)tan^(-1)(1)/(5)+tan^(-1)(1)/(7)+tan^(-1)(1)/(3)+tan^(-1)(1)/(8)=(pi)/(4)cot^(-1)7+cot^(-1)8+cot^(-1)18=cot^(-1)(1)/(13)

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

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