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)
pl send one question in one query.
Answered by | 20th Jul, 2009, 07:49: PM
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