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Which of the following is/are correct? ...

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`

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