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The sine of $45$ equals
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$\cos\left(45\right)\cos\left(60\right)- \frac{\sqrt{2}}{2}\sin\left(60\right)$
Learn how to solve simplify trigonometric expressions problems step by step online. Simplify the trigonometric expression cos(45)cos(60)-sin(45)sin(60). The sine of 45 equals . The sine of 60 equals . Multiply -1 times \frac{\sqrt{2}}{2}. Multiply -\frac{\sqrt{2}}{2} times \frac{\sqrt{3}}{2}.