simplify into simplest form sec(4π-theta)
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we have to convert simplest form of sec(4π - θ)
we know, sec(2π + θ) = secθ
sec(2π - θ) = secθ
[ because in fourth quadrant cosine and secant be positive. (360° - θ) or (2π - θ) lies in 4th quadrant so, sec(2π - θ) = secθ ]
now, sec(4π - θ) = sec{2π + (2π - θ)}
= sec(2π - θ)
= secθ [ as sec(2π - θ) = secθ]
hence, simplest form is secθ
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