Given △abc, sin(a) =

a. cos(b)
b. sin(b)
c. cos(c)
d. tan (c)

we know that

In a right triangle ABC

m∠A+m∠C= -------> by complementary angles

so

therefore

the answer is the option

C. cos(C)

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies