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ohh okay so u substituted it.. cool.. so easy n i couldn't even see it.....change 2cos2(theta -1 = o by substituting y= cos2(theta
i.e
2y - 1 = o Y is substituted for cos2(theta now it will be y = 1/2
U can see frm graph that at how many positions is this line of y =1/2 cutting the graph (at four)
so what is the difference when the question says ' write down the number o roots' and ' deduce the number of roots' ?
when the interval changes to 10pi<= (theta)<=20pi what do i do? do i draw another graph?