Recognize the integral: Recognize the integral that needs to be solved.We need to integrate the function sin2(x)cos2(x) with respect to x.
Use trigonometric identities: Use trigonometric identities to simplify the integrand.We can use the double angle identity for cosine, which is cos(2x)=2cos2(x)−1 or cos2(x)=21+cos(2x). Similarly, for sine, we have sin2(x)=21−cos(2x).
Substitute the identities: Substitute the identities into the integral. The integral becomes ∫[21−cos(2x)]∗[21+cos(2x)]dx.
Expand the integrand: Expand the integrand.Expanding the integrand gives us ∫(41−4cos2(2x))dx.
Split the integral: Split the integral into two separate integrals.We now have (41)∫dx−(41)∫cos2(2x)dx.
Integrate the first part: Integrate the first part of the integral.The integral of dx is x, so the first part becomes (1/4)x.
Use a trigonometric identity: Use a trigonometric identity to simplify the second integral.We can use the power reduction identity for cos2(2x), which is cos2(2x)=21+cos(4x).
Substitute the identity: Substitute the identity into the second integral.The second integral becomes (41)∫(21+2cos(4x))dx.
Simplify the second integral: Simplify the second integral.This simplifies to (81)∫dx+(81)∫cos(4x)dx.
Integrate the simplified second integral: Integrate the simplified second integral.The integral of dx is x, and the integral of cos(4x) is (1/4)sin(4x), so the second part becomes (1/8)x+(1/32)sin(4x).
Combine the results: Combine the results from Step 6 and Step 10.The final answer is (41)x−[(81)x+(321)sin(4x)]+C, where C is the constant of integration.
Simplify the final expression: Simplify the final expression.Combine like terms to get the final answer: 81x−321sin(4x)+C.