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[/ABC,AB=7cm,BC=5cm,CA=],[" A pole is st...

[/_ABC,AB=7cm,BC=5cm,CA=],[" A pole is stand at mid point of side "AC.],[" Angle of elevation of pole from vertex "B" is "],[30^(@)," find height of pole (a) "(sqrt(7))/(sqrt(3))" (b) "(2sqrt(7))/(sqrt(3))" (c) "],[2sqrt(21)" (d) "2sqrt(7)]

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Sides of triangleABC, AB=7 cm, BC=5cm, CA=6cm . A pole is stand at mid point of side AC . Angle of elevation of pole from vertex B is 30^@ , find height of pole (a) sqrt7/sqrt3 (b) (2sqrt7)/sqrt3 (c) 2sqrt21 (d) 2sqrt7

Sides of triangleABC, AB=7 cm, BC=5cm, CA=6cm . A pole is stand at mid point of side AC . Angle of elevation of pole from vertex B is 30^@ , find height of pole (a) sqrt7/sqrt3 (b) (2sqrt7)/sqrt3 (c) 2sqrt21 (d) 2sqrt7

(sqrt(7)+2sqrt(3))(sqrt(7)-2sqrt(3))

(2sqrt(7))/(sqrt(5)-sqrt(3))

(3+sqrt(7))/(3-sqrt(7))=a+b sqrt(7)

(sqrt(7)-sqrt(5))^3 - (sqrt(7)+sqrt(5))^3

(5+2sqrt(3))/(7+4sqrt(3))=a-b sqrt(3)

(5+2sqrt(3))/(7+4sqrt(3))=a-b sqrt(3)

Evaluate (sqrt(5)-sqrt(3))/(sqrt(2)+sqrt(7))

(sqrt(3)-sqrt(5))(sqrt(3)+sqrt(5))/(sqrt(7)-2sqrt(5))