1.

If for real values of x, `costheta=x+(1)/(x)`, thenA. `theta` is an acute angleB. `theta` is right angleC. `theta` is an obtuse angleD. No value of `theta` is possible

Answer» Correct Answer - D
Here, `" "costheta=x+(1)/(x)`
`rArr" "costheta=(x^(2)+1)/(x)`
`" "x^(2)-xcostheta+1=0`
For real value of x, `(-costheta)^(2)-4xx1xx1=0`
`" "cos^(2)theta=4`
`" "costheta=pm2`
which is not possible. `" "[because-1lecosthetale1]`


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