NCERT ex 3.3 no.22 &25 questions

Asked by prassana | 15th Aug, 2009, 05:03: PM

Expert Answer:

we know the formula,

cot(A-B)=[cotAcotB+1]/[cotB-cotA]

Put A=3x , B=x

so we get,

cot(2x)=[cot2xcotx+1]/[cotx-cot3x]

cross multiplying,

we get the desired result.

 

pl send one question in one query, so you can send the second question as a seperate query.

 

Answered by  | 16th Aug, 2009, 09:49: AM

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