Use the double angle identity for cosine cos(2a) = 2cos2 a − 1 to derive the half-angle identity.

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase

Drag the tiles to the correct boxes to complete the pairs. label each function. as even , odd, or neither.

Ahmed plans to add a rectangular sunroom to his house. the sunroom will have a length of 14 feet and a width of 10 feet, and the construction will cost $40 per square foot. how much more would the sunroom cost if it’s width were increased to 12 feet?