Take a look: the distance d = SQRT(x^2 + (cos(x))^2) and its square
d^2=x^2 + (cos(x))^2 reaches the minimal value simultaneously. Thus
one can find minimum of d^2 because it looks easier.
caroline werner
15.01.14, 05:26
how did you get rid of the SQRT after the 5th step? you can't just
drop that trash....
Assignment Expert
05.04.13, 14:24
2x = sin(2x) Applying double angle formula we get 2x = 2sinx cosx or
x=sin x cos x This is a transcendental equation which can be solved
graphically. This equation has unique solution x=0.
imran sabir
04.04.13, 16:24
how did you go from 2x = sin(2x) to 2x = 0. How six(2x) =0?
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Take a look: the distance d = SQRT(x^2 + (cos(x))^2) and its square d^2=x^2 + (cos(x))^2 reaches the minimal value simultaneously. Thus one can find minimum of d^2 because it looks easier.
how did you get rid of the SQRT after the 5th step? you can't just drop that trash....
2x = sin(2x) Applying double angle formula we get 2x = 2sinx cosx or x=sin x cos x This is a transcendental equation which can be solved graphically. This equation has unique solution x=0.
how did you go from 2x = sin(2x) to 2x = 0. How six(2x) =0?
Leave a comment