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Use the formulas for sine and cosine of sums of angles, 30-60-90 degree triangles and the 45-45-90 degree triangles to find the sine and cosine

Use the formulas for sine and cosine of sums of angles, 30-60-90 degree triangles and the 45-45-90 degree triangles to find the sine and cosine of 75-25-90 degree triangles: sin(A+B)=sinA cosB +sinB cosA cos(A+B)=cosA cosB-sinA sinB 2 1 2 60 1 45c45 90 90 30 45c45 3 1

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