Tan(a/2) = sin a / (1 + cos a)
tan(45/2) = sin(45) / (1 + cos(45)) = (1/√2) / (1 + 1/√2) = (1/√2) / (√2 + 1)/√2 = 1/(√2 + 1) = (√2 - 1)
The formula is a permutation in which n represents the sample points in the set, while r represents the number of sample points in each permutation.
35%
divide whatever number you get move the decimal two spaces to the right and that is the percent.
A typewriter costing $75.00 marked up 40% on cost M = 40 and S = 105
