" Explain : "Delta H=q_(p)

What does Delta H= q_(p) refers to?

Which of the following expressions is not acceptable? (i) Delta P = P_(f) - P_(i) (ii) Delta_(w) = w_(f) - w_(i) (iii) Delta q = q_(f) - q_(i) (iv) Delta U = U_(f) - U_(i)

A vertical line passing through the point (h, 0) intersects the ellipse x^2/4+y^2/3=1 at the points P and Q .Let the tangents to the ellipse at P and Q meet at R . If Delta (h) Area of triangle DeltaPQR , and Delta_1 = max_(1/2<=h<=1)Delta(h) and Delta_2 = min_(1/2<=h<=1) Delta (h) Then 8/sqrt5 Delta_1-8Delta_2

A vertical line passing through the point (h, 0) intersects the ellipse x^2/4+y^2/3=1 at the points P and Q .Let the tangents to the ellipse at P and Q meet at R . If Delta (h) Area of triangle DeltaPQR , and Delta_1 = max_(1/2<=h<=1)Delta(h) and Delta_2 = min_(1/2<=h<=1) Delta (h) Then 8/sqrt5 Delta_1-8Delta_2

If, p,q,r are negative distinct real numbers , then the determinant Delta=|(p,q,r),(q,r,p),(r,p,q)| is :

Explain the step P and Q.