Identify Substitution: Identify a substitution that can simplify the integral.We can use the substitution u=sin(x), which implies du=cos(x)dx.
Rewrite in terms of u: Rewrite the integral in terms of u and du.The integral becomes ∫u5(1−u2)2du, since cos2(x)=1−sin2(x) and we have cos5(x)=cos(x)⋅(1−sin2(x))2.
Expand Integrand: Expand the integrand.We need to expand (1−u2)2 to integrate term by term. The expansion is (1−2u2+u4).
Multiply by u5: Multiply the expanded terms by u5.Multiplying u5 by each term in the expansion gives us u5−2u7+u9.
Integrate Each Term: Integrate each term separately.The integral of u5 is (u6)/6, the integral of −2u7 is (−2u8)/8, and the integral of u9 is (u10)/10.
Combine and Simplify: Combine the integrated terms and simplify.Combining the terms, we get (u6)/6−(u8)/4+(u10)/10.
Substitute back in x: Substitute back in terms of x.Since u=sin(x), we substitute back to get 6sin6(x)−4sin8(x)+10sin10(x)+C, where C is the constant of integration.