Integrate[Power[cos[x],3]Sin[x],x]

Indefinite integral

integral cos^3(x) sin(x) dx = -1/4 cos^4(x) + constant

Series expansion of the integral at x=0

-1/4 + x^2/2 - (5 x^4)/12 + O(x^6) (Taylor series)
Big‐O notation »
POWERED BY THE WOLFRAM LANGUAGE