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If f(theta)=sum(n=1)^(6)cos ec(theta+(...

If `f(theta)=sum_(n=1)^(6)cos ec(theta+((n-1)pi)/(4))cos ec(theta+(npi)/(4))`, where `0ltthetalt(pi)/(2)`, then find the minimum value of `f(theta)`.

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The correct Answer is:
`2sqrt(2)`
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