1just replace x by cos@
we get
(cos@)^2 +(cos(3@))^2=1
10 Answers
1Can we do it by quadratic eqn method i.e is
x2+16x6+9x2 - 24x4 -1 = 0
and then dividing it by x3 to get a quadratic eqn .????????
This ques seems to be more of Algebra and less of trignometry.
62That will be too difficult to handle..
see the expression closely.. it is very much trigonometry..
341it will be ± cos π/4 and ±cos π/8. Is that what u r trying to say?
1sir but by assuming x=cos@ ....am i not restricting the domain of function
341it is for you to justify your choice then. :D
But again, I like your question.
So tell us what allows you to conclude that by setting x = cos θ we are not excluding any real solutions.
1like if i substitute so, x can never exceed 1.......if i had to substitute x as some tan or cot ,i wud happily do it...as they give all real values...