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(187)/(rarr)cos[tan^(-1)(1)/(3)+tan^(-1)...

(187)/(rarr)cos[tan^(-1)(1)/(3)+tan^(-1)(1)/(2)]=

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Which of the following is/are correct? tan[cos^(-1)(4)/(5)+tan^(-1)(2)/(3)]=(17)/(6)cos[tan^(-1)(1)/(3)+tan^(-1)(1)/(2)]=(1)/(sqrt(2))cos2tan^(-1)((1)/(3))+cos(tan^(-1)2sqrt(2))=(14)/(15)cos[2cos^(-1)(1)/(5)+sin^(-1)(1)/(5)]=-(2sqrt(6))/(6)

tan(tan^(-1)((1)/(2))-tan^(-1)((1)/(3)))=

tan^(-1)2-tan^(-1)1=tan^(-1)(1)/(3)

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

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

tan^(-1)3-tan^(-1)2=tan^(-1)(1/7)

tan^(-1)3-tan^(-1)2=tan^(-1)(1/7)

cos[2(tan^(-1).(1)/(5)+tan^(-1)5)] = ________.