The equation $\sqrt{3} \sin x + \cos x = 4$ has

Manganese inhibits calcium translocation in $.......$

There are $n$ distinct points on the circumference of a circle. The number of pentagons that can be formed with these points as vertices is equal to the number of possible triangles. Then the value of $n$ is

Which of the following ions forms a highly soluble hydroxide in water?

If $\int(1-\cos x) \operatorname{cosec}^2 x \, dx = f(x) + c$, then $f(x)$ is equal to

In an elastic collision of two particles,which of the following quantities is conserved?