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" Q.17"cos[tan^(-1)(1)/(3)+tan^(-1)(1)/(...

" Q.17"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)

cos^(-1)(15/17)+2 tan^(-1)(1/5)=

cos^(-1)(15/17)+2 tan^(-1)(1/5)=

cos^(-1)(15/17)+2 tan^(-1)(1/5)=

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

Prove that 2"tan"^(-1)(1)/(2) +"tan"^(-1)(1)/(7) ="tan"^(-1)(31)/(17) .

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

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

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