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- Express in terms of sine and cosine
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- Simplify into a single function
- Express in terms of Sine
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- Express in terms of Secant
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Grouping all terms to the left side of the equation
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$\cos\left(2x\right)-\cos\left(x\right)=0$
Learn how to solve trigonometric equations problems step by step online. Solve the trigonometric equation cos(2x)=cos(x). Grouping all terms to the left side of the equation. Apply the trigonometric identity: \cos\left(2\theta \right)=2\cos\left(\theta \right)^2-1. We can try to factor the expression 2\cos\left(x\right)^2-1-\cos\left(x\right) by applying the following substitution. Substituting in the polynomial, the expression results in.