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the value of tan 70 o - tan 20 o - 2 tan 40 o ???

the value of  tan 70o   - tan 20 - 2 tan 40o ???

Grade:12th pass

3 Answers

ng29
1698 Points
6 years ago
hey mansi 
are u sure that its tan 40 in the question   i  had solved it for  tan50
 reply
mansi dabriwal
29 Points
6 years ago
yah...i got this question in arihant cd of bitsat u cn cross check...
ng29
1698 Points
6 years ago
then its answer may be   4 tan100
tan 70o   - tan 20 - 2 tan 40o
cot200 – tan200 – 2 tan400                                     using  cot x – tan x = 2 cot 2x
2 cot 400 – 2 tan 400
4 cot 80 0
4 tan 100
approve if useful
 
 

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