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.

## Answer this Question

## Related Questions

- math - If sin(x) = /45 and cos(y) = 5/13 with both x and y terminating in ...
- Math - If sin(x) = /45 and cos(y) = 5/13 with both x and y terminating in ...
- Math - If sin(x) = 4/5 and cos(y) = 5/13 with both x and y terminating in ...
- TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
- math - Determine exact value of cos(cos^-1(19 pi)). is this the cos (a+b)= cos a...
- Alg2/Trig - Find the exact value of the trigonometric function given that sin u...
- Trigonometry - If sin A = 3/5 and cos B = 24/25 and <A and <B are both in...
- Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...
- algebra - Can someone please help me do this problem? That would be great! ...
- Math - Calculus - The identity below is significant because it relates 3 ...