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If sin (θ + 180) = cos 600, then what is the value of cos5θ, where 00 < θ < 900?

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If sin (θ + 18<sup>0</sup>) = cos 60<sup>0</sup>, then what is the value of cos5θ, where 0<sup>0</sup> < θ < 90<sup>0</sup>?





 
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