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MIT 18.01 Single Variable Calculus (OCW)
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OpenStudy (anonymous):
A straight line is concave up
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OpenStudy (anonymous):
A straight line f(x) has not any concave shape, the first derivative f'(x) gonna be a constant, and f''(x)=0 and zero isn't positive or negative, in other word the rate of change of the slope is equal zero.
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