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" 18."tan^(-1)(1)/(4)+tan^(-1)(2)/(9)=si...

" 18."tan^(-1)(1)/(4)+tan^(-1)(2)/(9)=sin^(-1)(1)/(sqrt(5))

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tan^(-1)(1)/(4)+tan^(-1)(2)/(9)=tan^(-1)(1)/(2)

Prove: tan^(-1)(1/4)+tan^(-1)(2/9)=sin^(-1)(1/(sqrt(5)))

Prove: tan^(-1)(1/4)+tan^(-1)(2/9)=sin^(-1)(1/sqrt(5))

tan^(-1)((1)/(4))+tan^(-1)((2)/(9))=tan^(-1)((1)/(2))

Prove that : tan^(-1)(1/4)+tan^(-1)(2/9)=sin^(-1)(1/sqrt5) .

Prove that : tan^(-1).(1)/(4)+tan^(-1).(2)/(9)=(1)/(2)sin^(-1).(4)/(5)

Prove that 2tan^(-1)((1)/(2))+tan^(-1)((1)/(7))=sin^(-1)((31)/(25sqrt(2)))

Prove that 2tan^(-1)(1/2)+tan^(-1)(1/7)=sin^(-1)((31)/(25sqrt(2)))

2 ( tan ^(-1)""(1)/(4) +tan ^(-1)""(2)/(9))=cos ^(-1)""(3)/(5)

Prove that : 2 "tan"^(-1)1/(2)+"tan"^(-1)1/(7)="sin"^(-1)31/(25sqrt(2)) .