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Question
Choose the correct alternative:
If cos pθ + cos qθ = 0 and if p ≠ q, then θ is equal to (n is any integer)
Options
`(pi(3"n" + 1))/("p" - "q")`
`(pi(2"n" + 1))/("p" +- "q")`
`(pi("n" +- 1))/("p" +- "q")`
`(pi("n" + 2))/("p" + "q")`
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Solution
`(pi(2"n" + 1))/("p" +- "q"`
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