Tg105°-cotg105° = ?
Please help fast!!! Please

Using only the trig ratios of 45 and 60 degrees, we use angle-sum to compute so and

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

x( x^2 +x -3x -3)

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option