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Divide $1$ by $2$
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$\cos\left(15\right)=30\frac{1}{2}$
Learn how to solve equations problems step by step online. Solve the equation cos(15)=301/2. Divide 1 by 2. Multiply 30 times \frac{1}{2}. The cosine of 15 equals 0.9659258. 0.9659258 is not equal to 15.