1.

If the solutions of cosp theta+cosqtheta=0 are I A.P. the the common difference of A.P. is

Answer»

`(PI)/(p+q)or(pi)/(p-q)`
`(2PI)/(p+q)or(2pi)/(p-q)`
`(pi)/(2(p+q))or(pi)/(2(p-q))`
`(2pi)/(p+q)or(pi)/(2(p-q))`

ANSWER :B


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