Francene Baranski
Thursday, August 11, 2011
Need help in Trigonometry!?
1. using formula, tan(A+B)=tanA+tanB / 1-tanAtanB ,we have, tan(20+25)=tan20+tan25 / 1-tan20tan25. now, tan(20+25)=tan45. therefore, 1= tan20+tan25 / 1-tan20tan25. therefore, by cross multiplying you will get the required answer.
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