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Use the cosine of a sum and cosine of a difference identities to find cos (s +t) and cos (s-t). 13 sins = and sint = 2, s a
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sind=B low glo 25 Cinc + Coff cos & = losins los (5) = 1-sins cos (8) = 22 25 I sin quadrant line I os ro in Quadrant cint

Cost - t I since tin Quadrant in I duadrant costo So I cost = 37 i cos (8+t) = cosso cost- sins. sint (va. Ih-ras] - Vaz-3) -

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