Show all steps necessary to verify the trigonometric identity:

1 - 2cos^2x = 2sin^2x - 1

Notice how the right hand side stays the same the entire time. The goal is to transform one side into the other. You could transform the right side into the left side if you wanted. I used the pythagorean identity in which I solved for cos^2 to get

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98