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Mathematics
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OpenStudy (anonymous):
please help! k = (cos 25° cos 35°) / (cos 10° sin 20°) . so, cos 10° equal to.... a. (k√3+1)/(2k-2) b. (k√3+1)/(2k+1) c. (k√3+1)/(2k+2) d. (k√3+1)/(k+1) e. (k√3+1)/(k-1) (choose one option that is correct and give the explanation)
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