Fastest one gets brainle

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.