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Posted by **Anamika** on Tuesday, December 4, 2012 at 11:46am.

- maths --plse help me.. -
**Steve**, Tuesday, December 4, 2012 at 11:57amy'(x) = 2cosx+2cos2x

y'(pi/3) = 1-1 = 0

y(pi/3) = √3+√3/2 = 3√3/2

so, we have the axes, and the lines y=3√3/2 and x=pi/3

the rectangle has area pi√3/2

- maths --plse help me.. -
**Anamika**, Tuesday, December 4, 2012 at 12:04pmplse read the question carefully...its find the area of quadrilateral not the rectangle.

- maths --plse help me.. -
**Steve**, Tuesday, December 4, 2012 at 12:13pmit happens that the quadrilateral formed by those lines is a rectangle.

the tangent is horizontal and the normal is vertical.

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