Posted by **Bryan** on Friday, March 19, 2010 at 3:10pm.

If sin(x) = /45 and cos(y) = 5/13 with both x and y terminating in quadrant 1 find the exact value of cos(x-y)

cos(4/5 - 5/13)

Is this what I would do?

- Math -
**Writeacher**, Friday, March 19, 2010 at 4:26pm
I've never heard of a School Subject called "Please help!!!"

Please type your __subject__ in the **School Subject** box. Any other words, including obscure abbreviations, are likely to delay responses from a teacher who knows that subject well.

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