manojbalaji1
if x and y are two real quantities, then show that the equation cosy= x + 1/x is impossible.



This Question is Closed

shivam_bhalla
Best Response
You've already chosen the best response.
3
Simply because
1<= cosx <=1

shivam_bhalla
Best Response
You've already chosen the best response.
3
x> any variable :) In your case,it's y

kevinkeegan
Best Response
You've already chosen the best response.
0
dw:1336390482629:dwdw:1336390511645:dw

shivam_bhalla
Best Response
You've already chosen the best response.
3
Take LCM of x+ 1/x and you will see that cosy is always greater than 1

shivam_bhalla
Best Response
You've already chosen the best response.
3
or lesser than 1

UnkleRhaukus
Best Response
You've already chosen the best response.
0
what if both x and y are complex/

him1618
Best Response
You've already chosen the best response.
0
use AM>GM

him1618
Best Response
You've already chosen the best response.
0
ull get x+ 1/x > 2

him1618
Best Response
You've already chosen the best response.
0
and cos y <=1

him1618
Best Response
You've already chosen the best response.
0
so they can ne ver be equated