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Applying the pythagorean identity: $\cos^2(\theta)=1-\sin(\theta)^2$
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$\frac{4e^{\left(2x+1\right)}\left(1-\sin\left(3x\right)^2\right)}{\left(x^2-1\right)\sqrt{1-4x}}$
Learn how to solve problems step by step online. Simplify the expression (4e^(2x+1)cos(3x)^2)/((x^2-1)(1-4x)^1/2). Applying the pythagorean identity: \cos^2(\theta)=1-\sin(\theta)^2. Multiplying polynomials 4 and 1-\sin\left(3x\right)^2. Any expression multiplied by 1 is equal to itself. Multiply 4 times -1.