1.

prove that tan-1 (2/7)+tan-1(1/4)=tan-1(15/26)

Answer»

tan^-1A+tan^-1B=tan^-1(a+b/1-ab)hence put in given equationtan^-1(2/7+1/4/1-2/7*1/4)=tan^-1(8+7/28/1-2/28)tan^-1(15/28/26/28)tan^-1(15/26)



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