Question

cos inverse of (cos(-(pi)/(6))

Answer 1

± π / 6

Answer 2

Of course there're more

Answer 3

how do you find it though?

Answer 4

Sqrt[3]/2

Answer 5

The cos inverse and cos will "cancel" each other out, leaving the -π/6. Also, since cos(-A) = cos A, it can also be π/6. There are many more depending on your domain.

Answer 6

what if it is sec(sin^-1(-(2)/(5))) ?

Answer 7

5/sqrt(21)

Answer 8

thats not an option on my test