Find dy/dx if. y = inverse of cos x

dy/dx = -1 /√(1 - x^2).

Step-by-step explanation:

y = arccos x.

So x  = cos y

dx / dy = - sin y

dy / dx = -1 / sin y

But sin y = √( 1 - cos^2 y)

But cos y = x , so cos^2y = x^2

Therefore  

dy/dx = -1 / √(1 - x^2).

answer:

a=9

step-by-step explanation: lmk if you need a explanation

hi there!

first we need to find out how much they are adding to each number to make the next number.

ex: 4 + 4 = 8, 8 + 8 = 16, and so on.

so continuing with 32,

32 + 32 = 64

64 + 64 = 128

128 + 128 = 256

256 + 256 = 512

4, 8, 16, 32, 64, 128, 256, 512

the 8th term of the sequence will be 512

hope this ! ~