If the segments joining the points `A(a , b)a n d\ B(c , d)` subtends an angle `theta` at the origin, prove that : `cos theta=(a c+b d)/sqrt((a^2+b^2)(c^2+d^2))`

If the segments joining the points A(a , b)a n d\ B(c , d) subtends an angle theta at the origin, prove that : costheta=(a c+b d)/sqrt((a^2+b^2)(c^2+d^2))

If the segments joining the points A(a , b)a n d\ B(c , d) subtends an angle theta at the origin, prove that : costheta=(a c+b d)/(sqrt((a^2+b^2)(c^2+d^2)))

If the segments joining the points A(a , b)a n d\ B(c , d) subtends an angle theta at the origin, prove that : theta=(a c+b d)/((a^2+b^2)(c^2+d^2))

If the line segment joining the point A(a,b) and B(c,d) subtends an angle theta at the origin.Prove that cos theta=(ac+bd)/(sqrt((a^(2)+b^(2))*(c^(2)+d^(2))))

If the segments joining the points A(a,b) and B(c,d) subtends an angle theta at the origin,prove that :theta=(ac+bd)/((a^(2)+b^(2))(c^(2)+d^(2)))

If the line segment joining the points A(a,b) and B(c,d) subtends an angle theta at the origin, then costheta is equal to

If the line segment joining the points A(a,b) and B(c,d) subtends an angle theta at the origin, then costheta is equal to

If the line segment joining the points A(a,b) and B(a, -b) subtends an angle theta at the origin, show that cos theta = (a^2 - b^2)/(a^2 +b^2) .

If the line segment joining the points A(a,b) and B (c, d) subtends a right angle at the origin, show that ac+bd=0

If the line segment joining the points P (a,b) and Q(c,d) subtends an angle theta at the origin , then the value of costheta is a) (ab+cd)/(sqrt(a^(2)+b^(2))sqrt(c^(2)+d^(2))) b) (ab)/(sqrt(a^(2)+b^(2)))+(bd)/(sqrt(c^(2)+d^(2))) c) (ac+bd)/(sqrt(a^(2)+b^(2))sqrt(c^(2)+d^(2))) d) (ac-bd)/(sqrt(a^(2)+b^(2))sqrt(c^(2)+d^(2)))