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if the solution for theta of cos p ...

if the solution for ` theta ` of cos ` p theta + cos q theta =0` `p gt q gt 0` are in AP. Then the numerically smallest common difference of AP is

A

` (pi)/( p+q)`

B

`( 2pi ) /( p+q)`

C

`(pi)/(2 (p+q))`

D

`(1)/(p+q)`

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The correct Answer is:
B
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