f ( x ) = sin ( x ) {\displaystyle f(x)=\sin(x)} g ( x ) = cos ( x ) {\displaystyle g(x)=\cos(x)} h ( x ) = 2 x {\displaystyle h(x)=2x} p ( x ) = x 2 {\displaystyle p(x)={\frac {x}{2}}}
( f ⋅ g ) ( 3 π 4 ) = f ( g ( 3 π 4 ) = f ( − 2 2 ) = − 1 2 {\displaystyle (f\cdot g)({\frac {3\pi }{4}})=f(g({\frac {3\pi }{4}})=f\left(-{\frac {\sqrt {2}}{2}}\right)=-{\frac {1}{2}}}
