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Asked by | 27th Aug, 2008, 09:03: PM

Expert Answer:

we kno;w that tan(a+b)= ( tana + tanb ) / (1-tana tanb)

put a=30^o and b= 15^o

tan45 = 1 = (tan30+tan15) / (1-tan30 tan15)

(tan30+tan15) = 1-tan30 tan15

tan30 tan15 + tan30+tan15 =1

Answered by | 8th Sep, 2008, 06:03: PM

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