1.

Find the value of expression: `sin(2tan^(-1)1/3)+cos(tan^(-1)2sqrt(2))`A. `12/13`B. `13/14`C. `14/15`D. none of these

Answer» `sin(2tan^(-1)1/3)+cos(tan^(-1)2sqrt(2))`
`=sin(sin^(-1)3/5)+cos(cos^(-1)1/3)["before" 2tan^(-1)x=sin^(-1) (2x)/(1+x^(2))]`
`=3/5+1/3=14/15`


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