Find an equation of the tangent line at x = a.y = x - x2; a = 4
A. y = 7x + 16
B. y = 9x + 16
C. y = 9x - 16
D. y = -7x + 16
Answer: D
Mathematics
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and 
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Determine the quadrant containing ?.sec ? > 0 and tan ? < 0
A. I B. II C. III D. IV
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