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10 cards from this deck
Same gradient as curve at that point
Use derivative f′(a)f'(a)f′(a)
y−f(a)=f′(a)(x−a)y - f(a) = f'(a)(x - a)y−f(a)=f′(a)(x−a)
000
Perpendicular to tangent
−1-1−1
m_N = - rac{1}{m_T}
Angle line makes with positive x-axis (anticlockwise)
m=anhetam = an hetam=anheta
Acute (0°<heta<90°0° < heta < 90°0°<heta<90°)
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