Look at the figure: an image of a right triangle is shown with an angle labeled x.
if tan x° = j divided by 11 and sin x° = j divided by k, what is the value of cos x°?

cos x° = 11k
cos x° = 11j
cos x° = k divided by 11
cos x° = 11 divided by k

cos x° = 11 divided by k

Explanation:

Basic trigonometric identities are connected through a simple equation; tan x°=sin x°/cos x°, or speaking in letters: tangent of an angle is equal to the sine of that angle divided by the cosine of the same angle. So, in this case:

sin x° = j/k

tan x° = j/11

cos x° =?

Since tan x° = sin x°/cos x° that means that cos x° = sin x°/ tan x°

cos x° = j/k divided by j/11 which is equal to 11/k.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.