Two tangents are drawn from a point( -4,3) to the parabola y^2 =16x.If alpha is the angle between them then the value of cos alpha is
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y=mx +4/m is the general from tangent to this parabola it will also pass throw point -4,3 so putting the value we get two vale of m (slope),
now tan(alfa)= (m2-m1)/1+m1*m2
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