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