Which of the following is not possible.
`cos x= 2/3`

Which of the following is not possible. cosec x= 1/3

Which of the following is not possible. sin x= 1/2

Which of the following is not possible. tan x= 8

Which of the following subshells is not possible in an atom ?

Separate the intervals of monotonicity for the following functions. f(x) = 3 cos^(4) x + 10 cos^(3) x + 6 cos^(2) x - 3, x in [0, pi]

Which of the following complex is heteroleptic as well as unable to show geometrical isomerism [Co(NH3)6]Cl3 [Co(NH3)3]Cl3 [Co(NH3)5]Cl2 [Co(en2)Cl2]Cl