Anthony buys one pound of oranges for $12 and sells it for $14. How can he write the profit in his account book?
1 answer:
You might be interested in
Use Half-angle formula:
We need cos(x), which can be found using pythagorean identity:
Note that the angle is in 2nd quadrant indicating that cos(x) is negative.
Substitute this value into the half-angle formula:
We need cos(x), which can be found using pythagorean identity:
Note that the angle is in 2nd quadrant indicating that cos(x) is negative.
Substitute this value into the half-angle formula: