Simplify using trigonometric identities: We need to simplify the expression inside the integral before we can integrate. Let's start by using trigonometric identities to rewrite the terms involving sine and cosine. We know that sin(2x)=2sin(x)cos(x) and that sin2(x)+cos2(x)=1. We can use these identities to rewrite the integral in terms of sin(x) only.
Express cos2(x) in terms of sin2(x): First, let's express cos2(x) in terms of sin2(x) using the Pythagorean identity: cos2(x)=1−sin2(x). Then we can substitute this into the integral.The integral becomes:∫4sin2(x)+8sin(2x)−3(1−sin2(x))dxSimplify the expression:∫4sin2(x)+8sin(2x)−3+3sin2(x)dxCombine like terms:∫7sin2(x)+8sin(2x)−3dx
Address the term 8sin(2x): Now, let's address the term 8sin(2x). We can use the double-angle identity for sine, which we've already mentioned: sin(2x)=2sin(x)cos(x). Substituting this into the integral gives us:∫7sin2(x)+8(2sin(x)cos(x))−3dxSimplify the expression:∫7sin2(x)+16sin(x)cos(x)−3dx
Explore integration options: At this point, we need to find a way to integrate this expression. It's not immediately clear how to proceed, so let's try to simplify it further. One approach could be to use a substitution, but it's not obvious what substitution would work here. Another approach could be to rewrite the expression in a more familiar form, such as a sum of squares or a product of trigonometric functions. However, this expression does not lend itself easily to such simplifications. We may have made a mistake in our approach.
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