If the sin 60° = square root of three over two, then which statement is true?

Question

anonymous · Answer

cos 30° = square root of three over two, because the cosine and sine are complements
 cos 120° = square root of three over two, because the cosine and sine are supplements
 cos 30° = 0, because the cosine and sine are complements
 cos 120° = 0, because the cosine and sine are supplements

baru · Answer

sin and cos are complemntary
which means
$cos(\theta) = sin(90-\theta) $

baru · Answer

so which do u think the answer is?

anonymous · Answer

don't quite understand

baru · Answer

just substitute $ \theta=60^0 $ and see what u get

baru · Answer

* substitute in the formula i gave

anonymous · Answer

so cos 30=0

anonymous · Answer

is that right or is it cos 30= sr3/2

baru · Answer

did u try substituting in the formula like i said?

anonymous · Answer

yes i did i think the answer is a, cos 30= sr3/2 i that right?

baru · Answer

yes

baru · Answer

i hope u understood why thats the right answer :)

anonymous · Answer

yes i do thank you