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1yyu I'll ojj? nnnnk
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cos a . cosec a.√(sec^2 a - 1)
=> cos a. cosec a. √tan^2 a
=> cos a. cosec a. tan a
=> cos a. 1/sin a . sin a/ cos a
=> 1
=> cos a. cosec a. √tan^2 a
=> cos a. cosec a. tan a
=> cos a. 1/sin a . sin a/ cos a
=> 1
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