What's the scientific notation for 0.3643

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

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?

Find the measure of anglec in the following triangle