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# Solve the equation $\cos\left(135\right)=4\cos\left(\right)$

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Solving: $\cos\left(135\right)=4\cos\left(\right)$

false

##  Step-by-step Solution 

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The cosine of $135$ equals $-\frac{\sqrt{2}}{2}$

$-\frac{\sqrt{2}}{2}=4\cos\left(\right)$

Learn how to solve trigonometric equations problems step by step online.

$-\frac{\sqrt{2}}{2}=4\cos\left(\right)$

Learn how to solve trigonometric equations problems step by step online. Solve the equation cos(135)=4cos(). The cosine of 135 equals -\frac{\sqrt{2}}{2}. The cosine of 315 equals \frac{\sqrt{2}}{2}. Multiply -3 times \frac{\sqrt{2}}{2}. Subtract the values 45 and -2.121321.

false

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Find the discriminant

### Main Topic: Trigonometric Equations

A trigonometric equation is an equation in which one or more trigonometric ratios appear.

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