Hey, they look like my teeth

Calculus Level 4

The plot of the function

f ( x ) = sin ( csc ( x ) ) f(x) = \sin(\csc(x))

has a resemblance of the picture. Find the area of the 'molar' to 2 decimal places.


The answer is 4.73.

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3 solutions

We'll have to find the lowest points of the "molar" plot, and we can do so by differentiation:

f ( x ) = cos ( x ) ( cos ( 1 / sin x ) ) / ( sin x ) 2 = 0 f'(x) = -\cos(x)*(\cos(1/\sin x))/(\sin x)^2 = 0

There are many values that give f'(x) = 0, but the 2 corresponding coordinates to the figure are (0.2138, -1) and (2.9278, -1).

If we set a new function g(x) = \sin(\csc(x))+1, the "molar" will rise above the x-axis, and we can simply calculate the area by using definite integral from 0.2138 to 2.9278:

So the area is roughly 4.74.

Could you please tell us how you did integrate that function ? That's practically the hardest part

Radinoiu Damian - 6 years, 3 months ago
Galen Buhain
Jun 27, 2017

f'(x) = -cos(x)*(cos(1/sin x))/(sin x)^2 = 0

There are many values that give f'(x) = 0, but the 2 corresponding coordinates to the figure are (0.2138, -1) and (2.9278, -1).

If we set a new function g(x) = sin(csc(x))+1, the "molar" will rise above the x-axis, and we can simply calculate the area by using definite integral from 0.2138 to 2.9278:

Lowest points we can calculate easier by solving equation sin ( 1 sin ( x ) ) = 1 \sin(\frac1{\sin(x)})=-1 , and get simple equation sin ( x ) = 2 3 π \sin(x)=\frac2{3π} . Integral I have solved numerically

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