The equation (cos p – 1)x2 + (cos p)x +sin p = 0, where x is a variable, has real roots. Then the interval of p may be any one of the following:
the value of tan β is
which of the following is not the value of ?
If α, β, γ, δ are the solutions of the equation have equal tangents. Then the value of
The least value of
is applicable for and 18.added further.