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2014-10-16T23:43:51+05:30

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1+ tan25 + tan20 + tan20tan25 +1 - 1
2 + tan(25 + 20)(1 - tan20tan25) - (1 -  tan20tan25)  { using the formula you gave ie use                                                                                                      tan(A+B) = tanA+tanB/ 1- tanAtanB}
2 + (1 -  tan20tan25)(tan45 - 1)
2 + (1 -  tan20tan25)(1 - 1)
2 + 0 
 = 2 PROVED
1 5 1
esnd me the frnd request and write the question in my message i will answer it
pm
i need it in the morning i gotta submit morrow
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coz i ahve to know the ans. ri8 know