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What is the slope of the line normal to the tangent line of $f (x) = csc x + {cos}^{2} (5 x - π)$ $f(x) = cscx+cos^2(5x-pi)$ at $x = \frac{11 π}{8}$ $x= (11pi)/8$ ?
The length of the square plot in which roses are planted is 2 meters greater than the length of the square plot in which marigolds are planted. How much bigger in area is the rose plot than the marigold plot?