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Which of the following is the correct value of cos2 550 + cos2 350 + sin2 650 + sin2 250?

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Which of the following is the correct value of cos<sup>2</sup> 55<sup>0</sup> + cos<sup>2</sup> 35<sup>0</sup> + sin<sup>2</sup> 65<sup>0</sup> + sin<sup>2</sup> 25<sup>0</sup>?





 
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