(pi)x(pi)-1. If you wanted to use the less exact version of pi, it would be 3.14x2.14. But again, this is not as precise.
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Negative cosine f(x) = sin(x) f'(x) = -cos(x)
To differentiate something you multiply the power on the x with the number in front of it and then reduce the power by one in this case: 12x is the same as 12x^1 so the derivitive is 12*1*x^0 which is just 12
It is sec2.
The derivative of ( \ln x ) is ( \frac{1}{x} ) for ( x > 0 ). This means that as ( x ) increases, the slope of the tangent line to the curve ( y = \ln x ) at any point ( x ) is given by ( \frac{1}{x} ).
[2 x pie x radius] or [pie x diameter]