If sin y° = 9 divided by c and tan y° = 9 divided by d, what is the value of cos y°?

value of is

Step-by-step explanation:

Given :  

we have to find the value of  

Using trigonometric relation between  tangent , sine and cosine we have,

We are given

Substitute,  in relation above,  we have

solve for   , we have

Simplify , we get

Thus, value of is

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.