If $x = 2^{1/3} - 2^{-1/3}$,then $2x^3 + 6x = $

The main objective of the production/use of herbicide-resistant $GM$ crops is to

What is the output $Y$ in the following circuit,when all the three inputs $A, B, C$ are first $0$ then $1$?

If a gas contains only three molecules that move with velocities of $100, 200, 500 \ ms^{-1}$. What is the $rms$ velocity of that gas in $ms^{-1}$?

An air column in a tube $32 ~cm$ long,closed at one end,is in resonance with a tuning fork. The air column in another tube,open at both ends,of length $66 ~cm$ is in resonance with another tuning fork. When these two tuning forks are sounded together,they produce $8$ beats per second. Then the frequencies of the two tuning forks are (Consider fundamental frequencies only):

If the direction cosines of two lines are given by $l+m+n=0$ and $l^2-5m^2+n^2=0$,then the angle between them is