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Find an exact value.
sin 75°

\[\frac{ \sqrt{6}+\sqrt{2} }{ 4 }\]
Is this right?

How did you do it?

It is right, but what kind of help are you looking for?

Do you know the formula: sin(a+b)=sin(a)cos(b)+cos(a)sin(b)?

I am not familiar with that equation.

yes to find the final answer.

OK, I'll try to draw one...

I have a pic in front of me that I drew

I think you try to use "nice numbers" that add or subtract to get 75º
45º + 30º = 75º

now use sin(a+b)= sin(a)cos(b) + cos(a) sin(b)

I already figured that one out. I am working on\[\sin(-\frac{ 11\pi }{ 12 })\]

I (for one) switch to degrees first.

how do I do that?

|dw:1360100026509:dw|

So I would do sin(45-30)

phi, when you're done here, can you come back to my problem? thanks!

so would I do sin(45)cos(30)-cos(45)sin(30) next?

yes, but remember that sin is negative in the 3rd quadrant
so minus the final answer

you can always check your answers using a calculator. sin(-165º) = -0.2588...

Oh I wrote it wrong and forgot to negate it

Alright I will have to write that down. Thank you.

and basically I figured out how to use the equation

Good for you!