# How does this distribute?

1. Feb 19, 2010

### Ryuk1990

Let's say I have an expression like this.

cos45[(601-148)/sin21.8]

Does cos45 get multiplied into just the numerator terms or do I also distribute it to the denominator as well?

2. Feb 19, 2010

### n!kofeyn

Only the numerator. Think of it as cos(45)/1 so that cos(45) multiplies the numerator and 1 multiples the denominator.

Also, notice that cos(45) equals something simple.

3. Feb 19, 2010

### Pengwuino

Multiplying into the numerator and the denominator would give you $$\frac{cos(45)(601-148)}{cos(45)sin(21.8)}$$ and the cosines would cancel which is not what you want.

4. Feb 19, 2010

### Ryuk1990

Ok, thanks guys.