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- Express in terms of sine and cosine
- Simplify
- Simplify into a single function
- Express in terms of Sine
- Express in terms of Cosine
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- Express in terms of Cotangent
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Applying the trigonometric identity: $2\cos\left(\theta \right)^2-1 = \cos\left(2\theta \right)$

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$\cos\left(2x\right)=0$

Learn how to solve problems step by step online. Solve the trigonometric equation 2cos(x)^2-1=0. Applying the trigonometric identity: 2\cos\left(\theta \right)^2-1 = \cos\left(2\theta \right). The angles where the function \cos\left(2x\right) is 0 are. Solve the equation (1). Factor the polynomial 90+360n by it's greatest common factor (GCF): 90.

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