1.

Show that `sin^(- 1)(sin(3pi)/7)+cos^(- 1)(cos(46pi)/7)+tan^-1(-tan(13pi)/8)+cot^-1(cot(-(19pi)/8))=(13pi)/7`A. `16`B. `23`C. `20`D. `28`

Answer» Correct Answer - C
`because(13pi)/(7)=(api)/(b)thereforea+b=20`


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