sin(315°-60°)

Question

sin(315°-60°)

anonymous · Answer

That would be sin(255 degrees), which when converted into radians is 1.417 pi. Not sure what that is in fraction form, but I'm sure you could find it. Hope that helps!

geerky42 · Answer

Or to get exactly value, use this formula:
$$\sin(a-b) = \cos a ~\sin b - \cos b ~\sin a$$

anonymous · Answer

yes how do you use that formula to plug in?

anonymous · Answer

Isn't it the same either way? I just estimated the answer that my calculator gave me, so it should be the same. But yes that is another way of doing it.

geerky42 · Answer

a = 315º, b = 60º

anonymous · Answer

how do i solve it an do it like this?

anonymous · Answer

Assuming your values for the trigonometric functions are correct, now you just combine everything (I don't memorize the trig unit circle chart ^^").

anonymous · Answer

can you combine that I have trouble with doing that part

geerky42 · Answer

Just multiply. Numerators are multiplied together and denominators, same thing.

anonymous · Answer

Yes just multiply across as he said, then subtract.

geerky42 · Answer

After this, both term should have same denominator, just combine numerator together.

geerky42 · Answer

Yep.