trigonometry

Asked by paliwal.shreya | 20th Jul, 2009, 06:09: PM

Expert Answer:

tan(A+B)=tan A+tanB/(1-tanAtanB)

so

tanA+tanB=tan(A+B)*(1-tanAtanB)

so

tan20+tan25=tan45(1-tan20tan25)

so

tan20+tan25+tan20tan25=1..(since tan45 =1)

 

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Answered by  | 20th Jul, 2009, 07:49: PM

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