self Maths Puzzle

If tan theta- cot theta=a and cos theta -sin theta=b, then the value of (a^2+4)(b^2-1)is

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pls tell me the solution of the problm
11 years agoHelpfull: Yes(0) No(0)

is it -2/sin2theta?
11 years agoHelpfull: Yes(0) No(0)

self Other Question

A watch is sold at a profit of 30% had it been slod for Rs 80less, there would have been a loss of 10%. what is the cost price in rupees A and B can finish a piece of work in 20 days .B and C in 30 days and C and A in 40 days. In how many days will A alone finish the job
(a) 48
(b) 34 2/7
(c) 44
(d) 48