f(x^2)2x=3x^2 f(x)=(3/2)√x f(2)=(3√2)/2
f(x)=1+cosx-xsinx f(π /2)=1-(π /2)
原式=(1/2)∫(0,π/2)[(cosx)^8]dx=(1/2)(7/8)(5/6)(3/4)(1/2)(π/2)=105π/1536
原式=(3/4)(1/2)(π /2)=3π /16
