Derive these identities using the addition or subtraction formulas for sine or cosine:

a. sin a sin b = 1 / 2 (cos (a - b) - cos (a + b))

b. sin a cos b = 1 / 2 (sin (a + b) + sin (a - b))

Subtract. 3126 (-1742) a. 4868 b. 1384 c. 1384 d. 4868

How is 107.2 related to 1.072

Deon has 12 milliliters of 5% solution. He also has a solution that has a concentration of 30%. How many milliliters of the 30% solution does Deon need to add to the 5% solution to obtain a 20% solution

Two cars 280 km apart begin driving toward each other on a long straight highway One car travels 60 km per hour in the other 80 km per hour at the same time a canary starting on one car flies back and forth between the two cars as they approach each

If the height of the cone, h, is 15 centimeters and the radius of the base, r, is 5 centimeters, what is the volume of the conte? A. 375 centimeters3 B. 125 centimeters3 C. 225 centimeters3 D. 25 centimeters b. 125

What does proportional mean?

Probability is the a. numerical measure of the likelihood that an event will occur. b. chance that an event will not happen. c. number of successes divided by the standard deviation of the distribution. d.

The diagonal of a rectangle is 100 units. The width is 80 units. What is the area of the rectangle in square units.

Is 9m=9m the answer for 3 (m-3) = 3m-9? if not what is the answer?

During bully's first week working in China shop he breaks a vase that cost $45.89 two glasses that cost $16.25 each and a platter that cost $135.49 if he makes $5.25 an hour how many hours will we have to work to pay for the things he broke