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thank you!!

your welcome

wait did you like re-expand the problem after cos(5 pi/6) = -sqrt(3)/2

most of these problems are some identities written on the unit circle.

ok so 5pi/12 is 75 degrees rite

i guess.. lol is it?

okay but what does the 75 degrees have to do with the formula?

how is it done using half angle identity formula?!

so what in the world is the final answer? Is it cos(75)?