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Which of the following is true for the s...

Which of the following is true for the solid angle ?

A

`delta omega= (delta A cos theta)/r^2`

B

`delta omega= (delta A cos^2 theta)/r^2`

C

`delta omega= (delta A cos theta)/r^3`

D

`delta omega= (delta A cos^2 theta)/r^3`

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