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

" (iv) "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)

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 .

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