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The angle of elevation of a cloud from a...

The angle of elevation of a cloud from a point situated at a meter height from a lake is a and the angle of depression of its reflection is b. Height of the cloud is

A

`(a"sin"(alpha+beta))/("sin"(beta-alpha))m`

B

`(a"sin"(alpha+beta))/("sin"(alpha-beta))m`

C

`(a"sin"(beta-alpha))/("sin"(alpha+beta))m`

D

`a"sin"(alpha+beta)`

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