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सिद्ध कीजिए की : tan^(-1)((4)/(7))-tan...

सिद्ध कीजिए की :
`tan^(-1)((4)/(7))-tan^(-1)((1)/(5))=tan^(-1)((1)/(3))`

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tan^(-1)((4)/(7))+tan^(-1)((1)/(7)) = tan^(-1)((7)/(9))

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

2tan^(-1)((1)/(5))+tan^(-1)((1)/(7))+2tan^(-1)((1)/(8))=

4tan^(-1)((1)/(5))-tan^(-1)((1)/(70))+tan^(-1)((1)/(99))=pi/4

tan(cos^(-1)((3)/(5))+tan^(-1)((1)/(4)))

4tan^(-1)((1)/(5))=tan^(-1)((1)/(70))+tan^(-1)((1)/(99))+(pi )/(4)

tan^(-1)7-tan^(-1)5=tan^(-1)(1)/(18)

tan^(-1)7-tan^(-1)5=tan^(-1)(1/18)

tan^(-1)((1)/(2))+tan^(-1)((1)/(3))=(pi)/(4)|0tan(1)+tan(1)

2 tan ^(-1) ""(1)/(5)+tan^(-1)"" (1)/(8)= tan ^(-1) ""(4)/(7)