The angle between the planes x+2y-3z+5=0...

The angle between the planes `x+2y-3z+5=0` and `4x+y+2z+3=0` is

A

(a) `0`

B

(b) `(pi)/(4)`

C

(c) `(pi)/(3)`

D

(d) `(pi)/(2)`

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The correct Answer is:

D

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