Question

If f(x) = 4cos³x – 3cosx, then find f (π/6)

Answer 1

Answer:

formula we know

$4cos³x – 3cosx = cos3x$

so, f(x) = Cos 3x

this implies, f(π/6) = Cos 3×π/6= Cos π/2

= 0

Answer 2

IF f(x)= 4cos³x- 3cos x, then find f(π/6)

*Answer is 0.*