The standard deviation σ of the first N natural numbers can be obtained using which one of the following formulae ?

Let x, y, z be positive real numbers such that x, y, z are in…

What is the value of tan 18°?

If sinθ = 3sin(θ + 2x), then the value of tan(θ + α) + 2…

The expression (sinα + sinβ)/(cosα + cosβ) is equal to

If K = sin(π/18) sin(5π/18) sin(7π/18), then what is the value of K?