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[" 17."sec[tan^(-1)5+tan^(-1)(1)/(5)-tan...

[" 17."sec[tan^(-1)5+tan^(-1)(1)/(5)-tan^(-1)(3)/(4)]=],[[" 1) "3/5," 2) "5/3," 3) "4/5," 4) "sqrt(2)]]

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

tan^(-1)((4)/(7))-tan^(-1)((1)/(5))=tan^(-1)((1)/(3))

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

tan^(-1)((3)/(4))+tan^(-1)((3)/(5))-tan^(-1)((8)/(19))=

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

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

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

Find - tan^(-1)((3)/(4))+tan^(-1)((3)/(5))-tan^(-1)((8)/(19))=

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