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Expand the expression $\left(12\cos\left(3x\right)+6\cos\left(3x\right)^2+\cos\left(3x\right)^3\right)^2$ using the square of a binomial
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$(a+b)^2=a^2+2ab+b^2$
Learn how to solve simplify trigonometric expressions problems step by step online. Expand and simplify the trigonometric expression (12cos(3x)+6cos(3x)^2cos(3x)^3)^2. Expand the expression \left(12\cos\left(3x\right)+6\cos\left(3x\right)^2+\cos\left(3x\right)^3\right)^2 using the square of a binomial. Take the square of the first term: 12\cos\left(3x\right). Twice (2) the product of the two terms: 12\cos\left(3x\right) and 6\cos\left(3x\right)^2. Take the square of the second term: 6\cos\left(3x\right)^2.