Question

The equation cos(pi/6-x) is equal to______.
A.) 1/2(cosx+ sqrt3 sinx)
B.)1/2(cosx- sqrt3 sinx)
C.)1/2(sqrt3 cosx- sinx)
D.)1/2(sqrt3 cosx+sinx)

Answer 1

Have you considered the cosine of a difference formula?

\(\cos(\alpha - \beta) = \cos(\alpha)\cos(\beta)+\sin(\beta)\sin(\alpha)\)

Answer 2

Is the answer C?

Answer 3

You tell me. How did you get that?

Answer 4

I messed up with the signs it is D because it is subtraction first and with the negative in the problem makes it addition

Answer 5

Do you believe it?

Answer 6

yep!

Answer 7

That's good enough for me. I won't even check it!