Which expression is equivalent to (sin x + 1)(sin x − 1)?

Keep in Mind the trigonometric Identity to solve the problem

sin²x+cos²x=1

cos²x= 1 - sin²x

Now, (Sin x -1)× (Sin x +1)

= (Sin²x-1²)→→→Used the Identity, (a-b)(a+b)=(a²-b²)

= Sin²x-1

= - (1-sin²x)

= -Cos²x

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

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step-by-step explanation: