Question: cos ? =-24/25, ? a lies in quadrant II, and sin B = ?21, lies in quadrant II Find cos (? + ?).-48-7?21/12514-24?21/125-14+24/21/12548+7?21/125


cos ? =-24/25, ? a lies in quadrant II, and sin B = ?21, ß lies in quadrant II Find cos (? + ?).-48-7?21/12514-24?21/125-14+24/21/12548+7?21/125
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