Solve the problem.Find the equation for the tangent plane to the surface 
at the point 
A. -7x - 7y + 9z = 5
B. x + y + z = 5
C. -7x - 7y + 9z = 1
D. x + y + z = 1
Answer: A
Mathematics
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The figure shows angle ? in standard position with its terminal side intersecting the unit circle. Evaluate sin ? and cos ?.
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, cos ? = 
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, cos ? = 
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Mathematics