IN the NCERT book exercise 8.1 7th question 

i saw your anser at ncert solution but i found that both the answers to be same that is 49/64.My doubt is when sin/cos=tan,therfore when cot square (in question ii part) is 49/64 then sin square/cot squre= tan square ther answer should be 64/49 know.How the same 49/64 will be the answer.(considering in question1/1 gets canncelled).

Asked by RAHUL rd | 26th Jul, 2014, 03:22: PM

Expert Answer:

fraction numerator open parentheses 1 plus sin theta close parentheses open parentheses 1 minus sin theta close parentheses over denominator open parentheses 1 plus cos theta close parentheses open parentheses 1 minus cos theta close parentheses end fraction equals fraction numerator 1 minus sin squared theta over denominator 1 minus cos squared theta end fraction equals fraction numerator cos squared theta over denominator sin squared theta end fraction equals c o t squared theta equals open parentheses 7 over 8 close parentheses squared equals 49 over 64

Answered by Dharma Teja | 27th Jul, 2014, 12:53: PM