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The sine of $45$ equals
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$2\cdot \frac{\sqrt{2}}{2}\cos\left(45\right)$
Learn how to solve simplify trigonometric expressions problems step by step online. Simplify the trigonometric expression 2sin(45)cos(45). The sine of 45 equals . Multiply 2 times \frac{\sqrt{2}}{2}. The cosine of 45 equals . Multiply \sqrt{2} times \frac{\sqrt{2}}{2}.