Explain in one clear sentence why the equation must be solved when setting up the…

MATHEMATICS · Subjective · A Level · Mathematics · Integration · Integration

Problem

Explain in one clear sentence why the equation

\sin x = \dfrac{x}{2}

must be solved when setting up the definite integral for the volume of the solid generated by revolving the region bounded by

y = \sin x

and

y = \dfrac{x}{2}

about the

x

-axis.